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2. https://www.hhs.gov/about/news/2020/01/31/secretary-azar-declares-public-health-emergency-us-2019-novel-coronavirus.html
3. John Hopkins University Coronavirus Resource Center 2020 https://coronavirus.jhu.edu/us-map
4. Mental health and the Covid-19 pandemic;Pfefferbaum;N Engl J Med,2020
5. The mental health consequences of COVID-19 and physical distancing: The need for prevention and early intervention;Galea;JAMA Internal Med,2020