Bishop P R, Nowicki M J, Parker P H
Department of Pediatrics, Division of Pediatric Gastroenterology and Nutrition, Blair E. Batson Children's Hospital, University of Mississippi Medical Center, Jackson 39216, USA.
J Pediatr Gastroenterol Nutr. 2000 Apr;30(4):436-41. doi: 10.1097/00005176-200004000-00017.