1 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California (Y.M.).
2 Department of Hematology and Oncology, Cleveland Clinic Taussig Cancer Center, Cleveland, Ohio (T.B.).
3 Department of Medicine, Division of General Internal Medicine, University of Tennessee Health Science Center, Memphis, Tennessee (D.B.).
4 Critical Care Medicine Department, National Institutes of Health Clinical Center, and National Heart, Lung, and Blood Institute, Bethesda, Maryland (M.N.).