1. Center for Applied Health Research on Aging, Feinberg School of Medicine, Northwestern University, Chicago, Illinois (M.S.W., L.O., R.M.O., L.C., J.Y.B., G.W., S.B., M.E., P.Z., A.R., M.A., S.C.B.)
2. Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania (M.S.)
3. Feinberg School of Medicine, Northwestern University, Chicago, Illinois (D.L., M.K., S.D.P., T.R., J.A.L.)