و آر ایل:http://static1.squarespace.com/static/5e0095adfe247e1fe5aaa5f9/t/5e824707198af12c786beb07/1585596179589/19.jpg?format=1500w
و آر ایل:https://www.drtomfrieden.net/blog/dr-tom-frieden-on-19-critical-data-gaps-limiting-our-effectiveness-in-responding-to-the-covid-19-pandemic
