1. Responding to Covid-19 - a once-in-a-century pandemic?;Gates;N Engl J Med,2020
2. Naming the Coronavirus Disease (COVID-19) and the Virus that Causes it;WHO,2020
3. Coronavirus Disease (COVID-19) Pandemic;WHO,2020
4. Worldometer. Covid-19 Coronavirus Pandemic. The United States;Anonymous,2020
5. Are high-performing health systems resilient against the COVID-19 epidemic?;Legido-Quigley;Lancet,2020