1. From the Department of Population Medicine, Harvard Medical School, and Harvard Pilgrim Health Care Institute (J.L.M., D.S.K.), and the Division of Infectious Diseases, Beth Israel Deaconess Medical Center (D.S.K.) — all in Boston; the Department of Dermatology, Kaiser Permanente San Francisco Medical Center, San Francisco (K.A.K.); and the Department of Psychology, George Washington University, Washington, DC (S.K.C.).