Udall J N, Hempe J M, Schmidt-Sommerfeld E, Scheer W D, Mannick E, Blecker U, Correa H
Department of Pediatrics, Children's Hospital and Louisiana State University Medical Center, New Orleans 70112-2822, USA.
J Pediatr Gastroenterol Nutr. 1999 May;28(5):502-5. doi: 10.1097/00005176-199905000-00012.