From the Departments of Obstetrics, Gynecology, and Reproductive Sciences (C.R.C., S.N., A.H.) and Laboratory Medicine (L.G., S. Miller), University of California, San Francisco, San Francisco, the Department of Family Medicine, University of California, San Diego, San Diego (S. Morris), and Osel, Mountain View (T.P.) - all in California; Emmes, Rockville, MD (M.R.W., J.P.); the Department of Medicine, Ruth M. Rothstein CORE Center and Stroger Hospital of Cook County Health, Rush University Medical Center, Chicago (A.L.F.); and the Division of Infectious Diseases, Department of Medicine, Washington University, St. Louis (H.R.).