1. From the Departments of Biostatistics (W.T., G.J.E., H.L., L.M.P.), Pediatrics (T.S.H., L.A.D.), Medicine (M.A.W., J.H.P.), and Medical and Molecular Genetics (J.J.), and the Regenstrief Institute (W.T.), Indiana University School of Medicine and VA Medical Center (M.A.W., J.H.P.), Indianapolis, IN; and National Institute of Alcohol Abuse and Alcoholism, Bethesda, MD (J.J.).