1. Johns Hopkins University School of Medicine, Baltimore, Maryland (C.M.D., M.G.B., A.G.T., L.M.K., A.C., N.M.D., M.S.)
2. Johns Hopkins University School of Medicine and Johns Hopkins School of Public Health, Baltimore, Maryland (A.B.M.)
3. Johns Hopkins University School of Medicine and Johns Hopkins School of Public Health, Baltimore, Maryland, and Scientific Registry of Transplant Recipients, Minneapolis, Minnesota (D.L.S.)