1. Departments of Surgery (M.A.Z., M.S., Y.G., Y.T., W.C.D.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21205
2. Departments of Pathology (W.H.W.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21205
3. National Institute of Diabetes, Digestive, and Kidney Diseases (L.D.K.), National Institutes of Health, Bethesda, Maryland 20892
4. Departments of Medicine (M.A.L.), Johns Hopkins Medical Institutions, Baltimore, Maryland 21205