1 From the Icahn School of Medicine at Mount Sinai (C.K.A., M.D.A.), Weill Cornell Medical College (R.T.B.), and the James J. Peters Veterans Affairs Medical Center (M.D.A.) - all in New York; the Perelman School of Medicine, Philadelphia (N.B.C.); Harvard Medical School, Boston (D.C.G.); Brown University School of Public Health, Providence, RI (D.J.M., A.R., J.M.T.); Vanderbilt University and the Veterans Affairs Tennessee Valley Healthcare System - both in Nashville (D.S.); and the RAND Corporation, Arlington, VA (J.M.T.).