1. From the Departments of Medicine (M.M.M., P.G., D.G., G.M., M.Q., P.M.R.), Preventive Medicine (M.M.M., P.G., K.L., C.C.), and Surgery (W.H.P., J.R.S.), Northwestern University’s Feinberg School of Medicine, Chicago, Ill; National Institute on Aging (J.M.G.), Bethesda, Md; University of California at San Diego (M.H.C.), San Diego, Calif; Oregon Health and Science University (L.T.), Portland, Ore; Harvard Medical School (P.M.R., N.R.), Boston, Mass; Department of Surgery, Evanston Hospital (J.R.S.),...