Novel Coronavirus General Info
An ad hoc and unofficial collection of resources. I live in Illinois, so I'm including Illinois-specific resources. - Hal Snyder, M.D.
Contents:
Update on face masks
Note: This information is about face coverings worn to prevent infecting others, sometimes known as "source control" measures. See the PPE topic below for info about masks to protect the wearer.
Several recent publications indicating universal wearing of face masks, even homemade masks and simple cloth coverings, can prevent spread of the pandemic.
Health Affairs: JUNE 16, 2020 Community Use Of Face Masks And COVID-19: Evidence From A Natural Experiment Of State Mandates In The US
EFFECTS OF MANDATES FOR FACE COVERING IN PUBLIC
no evidence of declines in daily COVID-19 growth rates with the employee-only mandates
direct evidence on the effectiveness of widespread community use of face masks
230,000–450,000 COVID-19 cases may have been averted based on when states passed these [community use of face masks] mandates
Proceedings of the National Academy of Sciences (PNAS): June 11, 2020: Identifying airborne transmission as the dominant route for the spread of COVID-19
Our analysis reveals that the difference with and without mandated face covering represents the determinant in shaping the trends of the pandemic. This protective measure significantly reduces the number of infections. Other mitigation measures, such as social distancing implemented in the United States, are insufficient by themselves in protecting the public.
Proceedings of the Royal Society A 10 June 2020: A modelling framework to assess the likely effectiveness of facemasks in combination with ‘lock-down’ in managing the COVID-19 pandemic
We show that, when facemasks are used by the public all the time (not just from when symptoms first appear), the effective reproduction number, , can be decreased below 1, leading to the mitigation of epidemic spread. Under certain conditions, when lock-down periods are implemented in combination with 100% facemask use, there is vastly less disease spread, secondary and tertiary waves are flattened and the epidemic is brought under control. The effect occurs even when it is assumed that facemasks are only 50% effective at capturing exhaled virus inoculum with an equal or lower efficiency on inhalation.
IZA – Institute of Labor Economics JUNE 2020: Face Masks Considerably Reduce COVID-19 Cases in Germany: A Synthetic Control Method Approach
early introduction of face masks in Jena has resulted in a reduction of almost 25% in the cumulative number of reported Covid-19 cases after 20 days. The drop is greatest, larger than 50%, for the age group 60 years and above. ... After the introduction of the mandatory masks, "the number of new infections fell almost to zero"
Science 27 May 2020: Reducing transmission of SARS-CoV-2
Masks and testing are necessary to combat asymptomatic spread in aerosols and droplets
Vanity Fair MAY 8, 2020 If 80% of Americans Wore Masks, COVID-19 Infections Would Plummet, New Study Says refers to the following paper, I think - Hal
arXiv.org physics.soc-ph 22 Apr 2020: Universal Masking is Urgent in the COVID-19 Pandemic: SEIR and Agent Based Models, Empirical Validation, Policy Recommendations : alternate link
These effects hold even at the lower filtering rates of homemade masks
Reopening
How We Reopen Safely CovidExitStrategy.org Tracking states as they make progress towards gating criteria.
We are a group of public health & crisis experts with experience working at the White House, Department of Health & Human Services, and on the Ebola epidemic in West Africa.
2020-05-06 The Risks - Know Them - Avoid Them Erin Bromage
As states reopen, and we give the virus more fuel, all bets are off. I understand the reasons for reopening the economy, but I've said before, if you don't solve the biology, the economy won't recover.
2020-04-15 Our Pandemic Summer
The fight against the coronavirus won’t be over when the U.S. reopens. Here’s how the nation must prepare itself.
2020-04-06 Lockdown Can’t Last Forever. Here’s How to Lift It By Gabriel Leung
Dr. Leung is an infectious disease epidemiologist and dean of medicine at the University of Hong Kong.
We need to hit and release the brakes on physical distancing, again and again, until we safely get to immunity.
Note: for some reason, NYT kept this important article behind their paywall.
Stanford Survey
Please consider participating in the Stanford Medicine National Daily Health Survey. The goal is to learn and predict which geographical areas will be most impacted by coronavirus. It takes a minute or two the first day and just seconds on following days.
Terminology
--
The disease: COVID-19 - coronavirus disease.
The virus: SARS-CoV-2 - severe acute respiratory syndrome coronavirus 2.
Reference:
public health terms: containment, mitigation, suppression
See "Impact of non-pharmaceutical interventions (NPIs)..." and "The Hammer and the Dance" below for use of these terms.
containment: tracking the dissemination of a disease within a community, and then using isolation and individual quarantines to keep people who have been infected by or exposed to the disease from spreading it
mitigation: slowing but not necessarily stopping epidemic spread – reducing peak healthcare demand while protecting those most at risk of severe disease from infection... for example:
home isolation of suspect cases
home quarantine of those living in the same household as suspect cases
social distancing of the elderly and others at most risk of severe disease
source: Impact of non-pharmaceutical interventions (NPIs) to reduce COVID19 mortality and healthcare demand
suppression: reversing epidemic growth, reducing case numbers to low levels and maintaining that situation indefinitely, for example:
social distancing of the entire population
home isolation of cases and household quarantine of their family members
school and university closures
source: Impact of non-pharmaceutical interventions (NPIs) to reduce COVID19 mortality and healthcare demand
sensory changes with COVID-19
anosmia: loss of sense of smell
also hyposmia, reduced ability to smell things
ageusia: loss of sense of taste
also hypogeusia, reduced ability to taste things
NOTE: 2020-03-21 ENT UK: Loss of sense of smell as marker of COVID-19 infection (slow link)
there have been a rapidly growing number of reports of a significant increase in the number of patients presenting with anosmia in the absence of other symptoms
Two Purposes for Masks
Thanks to Carl T. Bergstrom (see twitter feeds below) for this clarification. Wording here is from Bergstrom's 2020-04-03 thread.
receiver protection: your mask protects you from others. A properly fitted N95 provides effective receiver protection, but fitting is very difficult and not easily achieved by members of the public without training and equipment.
source control: your mask protects others from you. A basic surgical-type face covering provides effective source control.
Personal Protective Equipment (PPE)
2020-04-07 Dr. John Campbell - To mask or not to mask
Dr. Campbell reviews a recent article by L. Bourouiba with implications that:
the 6-foot rule for social distancing may be inadequate in many settings
the distinction between droplets and aerosol is probably an oversimplification.
reference: Turbulent Gas Clouds and Respiratory Pathogen Emissions / Potential Implications for Reducing Transmission of COVID-19 by Lydia Bourouiba, PhD.
Forbes write-up of Dr. John Campbell: U.K. Educator Uses YouTube To Treat Panic Of Coronavirus Myths
2020-04-04 CDC Use of Cloth Face Coverings to Help Slow the Spread of COVID-19
includes do-it-yourself instructions for homemade cloth face coverings
2020-04-03 CDC Recommendation Regarding the Use of Cloth Face Coverings, Especially in Areas of Significant Community-Based Transmission
CDC recommends wearing cloth face coverings in public settings where other social distancing measures are difficult to maintain (e.g., grocery stores and pharmacies) especially in areas of significant community-based transmission.
2020-03-03 Leora Horwitz let’s have a chat about masks
Director, Center for Healthcare Innovation and Delivery Science @nyulangone ; general internist; mom of 3 boys.
Let me tell you what my hospital makes me do EVERY YEAR to make sure my N95 mask fits (yes, they come in sizes)...
OHSHA: COVID-19 Control and Prevention
Measures for protecting workers from exposure to, and infection with, the novel coronavirus, COVID-19 depend on the type of work being performed and exposure risk, including potential for interaction with infectious people and contamination of the work environment...
WHO: How to Put on and Take Off Personal Protective Equipment (PPE)
Making PPE
Smart Air: What Are The Best Materials for Making DIY Masks?
South China Morning Post: How to make your own mask: Hong Kong scientists reveal temporary solution
Lab tests by City University find home-made masks achieve 80 to 90 per cent function of regular ones in terms of filtration of aerosol and droplets
Prusa Protective Face Shield - RC2 - 3D printing
A prototype face shield that we developed. In three days, we went through dozens of prototypes and two verifications with the Czech Ministry of Health.
Dr. Lauren Streicher A Surgeon's Guide to Sewing a Surgical Mask
Organizations
American Medical Association (AMA)COVID-19 (2019 novel coronavirus) resource center for physicians
World Health Organization
Coronavirus disease (COVID-19) outbreak
https://www.who.int/emergencies/diseases/novel-coronavirus-2019
US CDC
2020-03-26 Cleaning and Disinfection for Households
2020-03-15 Get Your Mass Gatherings or Large Community Events Ready
Interim Guidance for Coronavirus Disease 2019 (COVID-19)
Therefore, CDC, in accordance with its guidance for large events and mass gatherings, recommends that for the next 8 weeks, organizers (whether groups or individuals) cancel or postpone in-person events that consist of 50 people or more throughout the United States.
Coronavirus (COVID-19) information portal
Community mitigation strategy (pdf)
As of March 12, Illinois is implementing strategies consistent with substantial community spread. - Hal
Center for Communicable Disease Dynamics at Harvard (CCDD)
Illinois Department of Public Health
county-level risk assessment tool "to help individuals, families and community groups inform their choices about personal and family gatherings, as well as what activities they choose to do" - Gov. Pritzker
Governor's daily video press conferences (usually 2:30 pm CDT) DISCONTINUED: Governor Pritzker's last daily briefing was Friday, 2020-05-29
also available at IDPH Facebook Page
good rush transcripts with commentary at Capitol Fax.com
Journals and Other Publications
Publishers provide the following content without a paywall.
Springer Nature SARS-CoV-2 and COVID-19
Elsevier Novel Coronavirus Information Center
The Lancet: COVID-19 Resource Centre
JAMA (Journal of the American Medical Association) Network: Coronavirus Disease 2019 (COVID-19)
NeJM (New England Journal of Medicine): Coronavirus (Covid-19)
MIT Technology Review: Coronavirus
Financial Times: Coronavirus: free to read
Frequently-updated Maps & Statistics
Nextstrain.org - Real-time tracking of pathogen evolution
Nextstrain is an open-source project to harness the scientific and public health potential of pathogen genome data. We provide a continually-updated view of publicly available data alongside powerful analytic and visualization tools for use by the community.
These are up-to-date values for Rt, a key measure of how fast the virus is growing. It’s the average number of people who become infected by an infectious person. If Rt is above 1.0, the virus will spread quickly. When Rt is below 1.0, the virus will stop spreading.
ESRI Impact Planning for COVID-19
Web app by the ArcGIS Business Analyst team at Esri, showing every county in the US - intended to assist with response planning.
ESRI blog posting introducing the maps Latest County-Level COVID-19 Data in ArcGIS Business Analyst
Google See how your community is moving around differently due to COVID-19
community mobility reports
Visual Capitalist Visualizing the History of Pandemics
This post and infographic are meant to provide historical context, and we will continue to update it as time goes on to maintain its accuracy.
Time Magazine Is the U.S. 'Flattening the Curve?' Check Our Coronavirus Chart for Daily Updates
the US and South Korea reported their first cases on the same day
Washington Post daily counts for coronavirus in the U.S.
Daily charts of confirmed cases and reported deaths for all US and for each state.
Citymapper Mobility Index (CMI) % of city moving compared to usual
Forbes article with CMI visualizations App Data Capture The Plunge In Urban Movement As Cities Enter Coronavirus Lockdown
2020-03-27 stats for a few cities
city 2 weeks ago last week yesterday Chicago 78% 17% 7% Seattle 47% 20% 9% Vienna 69% 7% 6%
Dadax Worldometer COVID-19 CORONAVIRUS PANDEMIC
includes table of Confirmed Cases and Deaths by Country, Territory, or Conveyance
COVID ACT NOW TEAM: Why you must act now
This model predicts the last day each state can act before the point of no return
Here is is the model as of 2020-03-25 for outcomes for Illinois:
Johns Hopkins CSSE: Coronavirus COVID-19 Global Cases map
Our World in Data: Coronavirus Disease (COVID-19) – Statistics and Research also listed under "Data and Notebooks" below
The Atlantic: COVID19 Tracker
test results from across the country. Maintained by The Atlantic since CDC stopped reporting number of tests.
The COVID Tracking Project collects information from 50 US states and the District of Columbia to provide the most comprehensive public data we can on state-level testing for the novel coronavirus, SARS-CoV-2.
HealthMap: Novel Coronavirus (COVID-19)
HealthMap, a team of researchers, epidemiologists and software developers at Boston Children's Hospital founded in 2006, is an established global leader in utilizing online informal sources for disease outbreak monitoring and real-time surveillance of emerging public health threats - from about
Financial Times: Coronavirus tracked: the latest figures as the pandemic spreads
The countries affected, the number of deaths and the economic impact
Avi Schiffmann: nCoV2019.live - impressive work by high school student
This site was created by Avi Schiffmann. I am a high schooler in Washington State, USA.
Illinois Persons Under Investigation (PUI) for COVID-19
MOOCs (massive open online courses)
Coursera
Coursera Together: Free online learning during COVID-19
we’re launching new, free resources, as well as surfacing interesting course collections, community discussions, and expert interviews. We’ll continue to update this list with new resources...
All of these may be taken for free. Some also have a paid option.
Institut Pasteur
FUN-MOOC (FUN = France Université Numérique): Emerging and re-emerging viruses - course materials in English
https://www.fun-mooc.fr/courses/course-v1:pasteur+96015+session01
Imperial College London
Science Matters: Let's Talk About COVID-19
HKU (University of Hong Kong)
Epidemics I
Epidemics II
3-Hour Workshop Joint SPH-JMSC Workshop for Journalists on COVID-19 and other infectious diseases
This workshop is a pilot programme jointly presented by The University of Hong Kong’s School of Public Health of HKUMed and Journalism and Media Studies Centre as part of an initiative to enable journalists to develop greater insight related to public health and science. The kick-off session addresses the basics of infectious diseases, which is highly relevant for COVID-19 and other infectious disease outbreaks.
program starts about 5 minutes into the video
OpenWHO - Responding to COVID-19
Real-time training during global emergencies is critical for effective preparedness and response. The COVID-19 Channel provides learning resources for health professionals, decision-makers and the public for the outbreak of coronavirus disease (COVID-19).
Twitter feeds
Larry Brilliant, MD, MPH
Epidemiologist, Ending Pandemics, wrote “Sometimes Brilliant.” Fmr head http://Google.org, Prof, U Mich; WHO smallpox, TED Prize. TIME100. Co-found Seva & The Well
2020-04-02 This graph (from #covidly) shows the relation between “incidence” of new case and “cumulative cases” and a way my profession judges how good or bad it is going. The US at the top right shows today we are losing the battle faster than any other country. This is not way to be great
Carl Bergstrom
Prof. Biol. @UW Information flow in biology, society, & science.
original & thoughtful covid-19 commentary - hal
Marc Lipsitch
Infectious disease epidemiologist and microbiologist, aspirational barista. Director @CCDD_HSPH
2020-03-26 https://twitter.com/mlipsitch/status/1243347447537115136
Tonight #DeborahBirx stated that models anticipating large-scale transmission of COVID-19 do not match reality on the ground...
It is a fundamental scientific error to take the current success of containment in some places as a sign that permanent containment is possible. We should work to make it possible, but 1918 flu and, frankly, the germ theory of disease show that containment is a temporary victory
Dr. Dena Grayson
2020-03-29 Q&A on Coronavirus. 30-minute video, everyday decontamination and other topics
physician (MD) and scientist (PhD). Expert on #Ebola and other #pandemic threats
https://denagrayson.com/ (website in maintenance mode at present)
Trevor Bedford
Scientist @fredhutch, studying viruses, evolution and immunity. Seattle
Article discussing mutation rate and transmission patterms.
Cryptic transmission of novel coronavirus revealed by genomic epidemiology
Bedford Lab blog
Liz Specht
Assoc. Director of Science & Technology @GoodFoodInst
Supporting alternative proteins for a sustainable food future. UCSD PhD, JHU ChemBE. Views my own.
thread
I think most people aren’t aware of the risk of systemic healthcare failure due to #COVID19 because they simply haven’t run the numbers yet. Let’s talk math.
Andy Slavit
Former Medicare, Medicaid & ACA head for Obama. Founded @usofcare & @townhallvntrs to make health care work. Never broke a website, only fixed a big one.
2020-04-04 Oxygen and COVID-19
The amount of oxygen to it takes to keep a COVID-19 patient alive is absolutely startling... Apparently 8 or more of those massive oxygen cylinders/day to keep someone alive.
2020-03-14 COVID-19 Prep Update
Last night I was on with state & local officials around the US well into the night. By March 23 many of our largest cities & hospitals are on course to be overrun with cases.
Important Articles and Graphics
3Blue1Brown
2020-03-27 Simulating an epidemic
Andy Slavitt takeaways from video
Quarantine is most effective at flattening
Quarantine plus contact tracing wins
Hand washing & social distance very helpful
Half measures, non-compliance weaken effectiveness
Central markets or city to city travel hurts
Quarantine length saves lives
2020-03-08 About exponential and logistic functions
Imperial College London, Ferguson, Laydon, et al.
2020-03-16 Impact of non-pharmaceutical interventions (NPIs) to reduce COVID19 mortality and healthcare demand
makes the case for suppression over mitigation
Kurzgesagt
2020-03-19 The Coronavirus Explained & What You Should Do
Harry Stevens
2020-03-14 Why outbreaks like coronavirus spread exponentially, and how to “flatten the curve”
excellent animated simulation of disease spread
The Washington Post is providing this story for free
Tomas Pueyo
2020-03-19 Coronavirus: The Hammer and the Dance
What the Next 18 Months Can Look Like, if Leaders Buy Us Time
2020-03-10 Coronavirus: Why You Must Act Now
1. Confirmed cases (orange) lagged behind actual cases (grey) by about 10 days.
2. The curve in actual cases turned down when lockdown started.
Alanna Shaikh | TEDxSMU
2020-03-11 Coronavirus Is Our Future
17-minute TEDx talk by a global health expert
Dylan Matthews/Vox.com
Carl Bergstrom/Drew Harris
Prof. of Biology @UW, Information flow in biology, society, and science.
2020-03-28 I'm trying to understand the new @UW_IHME #COVID19 forecasting model that was released this morning.
https://twitter.com/CT_Bergstrom/status/1235865328074153986?s=20
tweet citing original diagram by Drew Harris
Luca Dellanna
In blue, ICU & deaths from the flu. In yellow & red, from the virus Mortality % does not matter yet because the higher the yellow line, the higher the mortality OF ALL CONDITIONS you might visit a hospital for
But the real problem is resource saturation (translated) - Francesco Menegalli
Trevor Bedford
on average every other step in the transmission chain will have a mutation and so would look something like:
Systems Theory
Wicked problem Summary article in Wikipedia. Severe global pandemics are wicked problems.
How Complex Systems Fail, by Richard I. Cook, MD, Cognitive technologies Laboratory University of Chicago: Classic paper from 1998.
First-person Accounts
2020-03-27 London (?), Shiraz Maher
2020-03-25 New York City, Dr. Ashley Bray
13 Deaths in a Day: An ‘Apocalyptic’ Coronavirus Surge at an N.Y.C. Hospital with video.
"We don’t have the tools that we need."
2020-03-23 New York City, Craig Spencer MD MPH, Director of Global Health in Emergency Medicine @ColumbiaMed / @NYPhospital and Faculty in Forced Migration & Health @ColumbiaMSPH | @MSF_USA BoD |#Ebola survivor
2020-03-21 London, Natalie Silvey, Anaesthetic registrar, dabbles in healthcare policy and healthcare data geek. Proud Girly Swot, Feminist & European
2020-03-15 West Michigan, Dr. Rob Davidson, Dad, husband, ER doc, and Exec Dir of the Committee to Protect Medicare because ALL Americans need affordable healthcare, ,
2020-03-11 Western Europe, Physician
Here is how it looks in practice. Most of my childhood friends are now doctors working in north Italy. In Milan, in Bergamo, in Padua, they are having to choose between intubating a 40-year-old with two kids, a 40-year old who is fit and healthy with no co-morbidities, and a 60-year-old with high blood pressure, because they don't have enough beds. In the hallway, meanwhile, there are another 15 people waiting who are already hardly breathing and need oxygen.
2020-03-09 Bergamo, Italy, Silvia Stringhini, Social and lifecourse epidemiologist. Studies biological consequences of social inequalities / Dr. Daniele Macchini author of original Italian posting
English translation of a post of another ICU physician in , Dr. Daniele Macchini
the epidemiological disaster is taking place. And there are no more surgeons, urologists, orthopedists, we are only doctors who suddenly become part of a single team to face this tsunami that has overwhelmed us
Data and Notebooks
IHME COVID-19 Projections
projected hospital resource use for all US and individual states
The projections assume the continuation of strong social distancing measures and other protective measures.
New York Times We’re Sharing Coronavirus Case Data for Every U.S. County
Download county-level data for coronavirus cases in the United States from The New York Times on GitHub.
Covid Near You Excellent! Citizen Science joins the battle against COVID-19 - Hal
Created by epidemiologists and software developers at Harvard, Boston Children's Hospital and a group of volunteers from across the technology industry. Covid Near You uses crowdsourced data to visualize maps to help citizens and public health agencies identify current and potential hotspots for the recent pandemic coronavirus, COVID-19.
Corona Data Scraper pulls COVID-19 Coronavirus case data from verified sources, finds the corresponding GeoJSON features, and adds population data.
includes county-level stats with time series for much of the US
2D and 3D visualizations as well as access to the raw data
github project lazd / coronadatascraper
maintained by lazd (Larry Davis), twitter bio: Engineer, teacher, designer of drones. Senior Design Engineer on @Adobe’s design system, creator of Spectrum CSS. Fighting COVID-19 with data.
Unacast: Social Distancing Scoreboard based on mobile device data
2020-03-24 their blog posting The Unacast Social Distancing Scoreboard
2020-03-24 WaPo write-up Smartphone data reveal which Americans are social distancing (and not)
Kinsa US Health Weather Map
The U.S. Health Weather Map is a visualization of seasonal illness linked to fever - specifically influenza-like illness. The aggregate, anonymized data visualized here is a product of Kinsa’s network of Smart Thermometers and the accompanying mobile applications.
Enter a zip code or US county name and see map and timeline for observed and atypical illness levels.
Our World in Data: Coronavirus Disease (COVID-19) – Statistics and Research
The mission of Our World in Data is to make data and research on the world’s largest problems understandable and accessible.
this article focuses on a new, emerging global problem: the ongoing outbreak of the coronavirus disease [COVID-19]
Semantic Scholar: CORD-19 COVID-19 Open Research Dataset
Updated 3/27. Highlights include:
Launched the easy-to-use CORD-19 Explorer for quick searching
Opened up CORD-19 Discourse, a forum for ideas and discussions
Added nearly 5,000 new full-text papers
Example notebooks by the CoCalc Team
SARS-CoV-19 Corona Virus Data jupyter notebook by Harald Schilly using datasets from Kaggle
Sage Worksheets by Hal Snyder; bar plots using API & data from the Covid Tracking Project
2019 Novel Coronavirus COVID-19 (2019-nCoV) Data Repository by Johns Hopkins CSSE
This is the data repository for the 2019 Novel Coronavirus Visual Dashboard operated by the Johns Hopkins University Center for Systems Science and Engineering (JHU CSSE). Also, Supported by ESRI Living Atlas Team and the Johns Hopkins University Applied Physics Lab (JHU APL).
Daily reports and time series data uploaded once a day around 23:59 (UTC):
THE FOLDING@HOME CONSORTIUM (FAHC) Coronavirus – What we’re doing and how you can help
Donate home computing power to run simulations of how all the atoms in selected viral proteins move. This can reveal potential binding sites for new anti-viral drugs.
Food Safety
Harvard T. H. Chan School of Public Health : Food safety, nutrition, and wellness during COVID-19
Dr. Jeffrey VanWingen
PSA Safe Grocery Shopping in COVID-19 Pandemic – UPDATED!!!
UC Davis: Food-related Resources for CoVID19 (Coronavirus) for Consumers and Food Industry
Australian Food News: Implications of Novel Coronavirus (Covid-19) for Food Processing
Illinois Resources
Cook County Dept of Public Health (CCDPH) COVID-19 Surveillance Data
This data represents all confirmed cases of COVID-19 reported to the Cook County Department of Public Health (CCDPH). The jurisdiction of CCDPH includes all municipalities and portions of municipalities within Cook County, except for Chicago, Evanston, Oak Park, Skokie and Stickney Township, each of which has its own state-certified local health department.
IRMA: COVID-19 Special Shopping Hours For senior citizens and other vulnerable populations
United Way of Illinois, Alliance of Illinois Community Foundations, et al: Illinois COVID-19 Response Fund
Celebrity videos to cheer us up
Arnold Schwarzenegger
About this file
Maintained by Hal Snyder, M.D. If you have suggestions, email [email protected].
This file is hosted on the CoCalc share server