Division of Gastroenterology, British Columbia Children's Hospital; and *Department of Pathology and Laboratory Medicine, Children's and Women's Health Center of British Columbia, Vancouver, British Columbia, Canada
Received January 15, 1999; revised May 14, 1999; accepted May 20, 1999.
Current address: Ranjan Dohil, Joint Program in Pediatric Gastroenterology and Nutrition, UCSD Medical Center, San Diego, CA, U.S.A.
Address correspondence and reprint requests to Eric Hassall, MBChB, FRCP(C), Division of Gastroenterology, BC Children's Hospital, 4480 Oak Street, Vancouver, B.C. V6H 3V4, Canada.