1. Division of General Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (Z.K., E.E.R.)
2. Division of Pulmonary, Critical Care and Sleep Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts (K.B.)
3. Division of Pulmonary and Critical Care Medicine, and Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, Virginia (T.D.B.).