1. From the Department of Medicine (C.S., G.J.E., T.-Y.C., M.A.W., Q.Z, J.H.P.), Indiana University School of Medicine, and the Richard L. Roudebush V.A. Medical Center (J.H.P.), Indianapolis, Ind; and the Department of Public Health Sciences (W.T.A.), Wake Forest University School of Medicine, Winston-Salem, NC.