1. From the Department of Medicine (A.J.B.), Divisions of Hematology and Oncology (R.L.O.), Infectious Diseases (B.S.S.), and Pulmonary, Critical Care, Allergy, and Sleep Medicine (B.L.B.), University of California, San Francisco, San Francisco, and the Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of California, San Diego, La Jolla (B.Y.S.).