Affiliation: | aJ. E. Dietscher is with the Section of Nutrition of the Division of Gastroenterology, and C. J. Foulks is chairman of the Department of Medicine, University of North Dakota, Fargo, USA;bR. W. Smith is with the Department of Surgery, Scott & White Clinic and Memorial Hospital, Scott, Sherwood and Brindley Foundation, Texas A&M University Health Science Center College of Medicine, Temple, USA. |