Kahn Stacy A, Kirschner Barbara S
Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, University of Chicago, IL, USA.
J Pediatr Gastroenterol Nutr. 2006 Aug;43(2):256-9. doi: 10.1097/01.mpg.0000221904.68781.03.