1. From Feinberg School of Medicine at Northwestern University (M.M.M., P.G., W.H.P., K.L., C.C., L.S., J.R.S., D.G., M.Q.), Chicago, Ill; Laboratory of Epidemiology, Demography, and Biometry (J.M.G.), National Institute on Aging, Bethesda, Md; University of California at San Diego (M.H.C.), San Diego, Calif; Oregon Health Sciences Medical Center (L.T., C.C.), Portland, Ore; Evanston Hospital (J.R.S.), Evanston, Ill; and Brigham and Women’s Hospital (P.M.R.), Harvard Medical School, Boston, Mass.