Yoon Christina, Dowdy David W, Esmail Hanif, MacPherson Peter, Schumacher Samuel G
Department of Medicine, Division of Pulmonary and Critical Care Medicine, Zuckerberg San Francisco General Hospital, University of California, San Francisco, CA 94110, USA.
Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
Lancet Respir Med. 2019 Mar;7(3):202-204. doi: 10.1016/S2213-2600(19)30039-6.