1. Lung Center, Division of Pulmonary, Critical Care and Sleep Medicine, University of California, Davis School of Medicine, Davis, CA (E.A.G., T.V.K.).
2. Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center, Stanford, CA (V.A.d.J.P.).
3. Department of Medicine, Division of Endocrinology, University of Arizona College of Medicine, Tucson, AZ (O.R.).