John S Fordtran1, Robert Prince, Donald W Seldin. 1. Division of Gastroenterology, Department of Internal Medicine, Baylor University Medical Center at Dallas (Fordtran); the Department of Obstetrics-Gynecology, St. Paul's Hospital and The University of Texas Southwestern Medical School at Dallas (emeritus) (Prince); and the Department of Internal Medicine, The University of Texas Southwestern Medical School at Dallas (Seldin).