1. From the Department of Medicine, Divisions of General Internal Medicine and Infectious Diseases, Albert Einstein College of Medicine and Montefiore Medical Center, Bronx, NY (M.J.A.); the Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta (A.C.S.); and the Departments of Medicine and Epidemiology, Division of Infectious Diseases, Brown University and the Miriam Hospital, Providence, RI (J.D.R.).