1. From the Howard Hughes Medical Institute (TVS., L.S.S., F.S.C.) and the Departments of Internal Medicine (C.T.H., F.S.C.) and Human Genetics (L.S.S., J.L.C., F.S.C.), University of Michigan, Ann Arbor; the Department of Medicine, University of North Carolina, Chapel Hill (S.V.T., M.R.K); Henry Ford Hospital, Detroit (M.C.I.); Presbyterian–St. Luke's Medical Center, Denver (T.L.P.); Miami Valley Hospital, Dayton, Ohio (M. W.C.); the Mayo Clinic, Rochester, Minn. (E.C.R.); and the Department of Genetics,...