1. Section of Gastroenterology/Hepatology; Georgia Regents University; Augusta GA USA
2. Department of Pediatric Gastroenterology; Emma Children's Hospital/Academic Medical Centre; Amsterdam The Netherlands
3. Department of Gastroenterology; Mayo Clinic; Rochester MN USA
4. Division of Gastroenterology of the University of Verona; A.O.U.I. Verona; Verona Italy
5. Division of Gastroenterology/Hepatology; University of North Carolina; Chapel Hill NC USA
6. Department of Pediatric Gastroenterology; Nationwide Children's Hospital; Columbus OH USA