1. From the Division of Pulmonary and Critical Care (M.K.H., C. Meldrum) and the School of Public Health (W.Y., D.W., E.W.), University of Michigan, Ann Arbor; the Division of Pulmonary, Critical Care, Allergy, and Sleep Medicine (M.A., S.C.L., P.G.W.) and the Cardiovascular Research Institute (S.C.L., P.G.W.), University of California San Francisco, and the San Francisco Veterans Affairs (VA) Healthcare System (M.A.) — both in San Francisco; the Division of Pulmonary and Critical Care Medicine, David...