1. Department of Gastroenterology; Medical Centre Rogaska; Rogaska Slatina; Slovenia
2. Department of Gastroenterology; Adelaide and Meath Hospital incorporating the National Children's Hospital/Trinity College Dublin; Dublin; Ireland
3. Gastroenterology Unit; Hospital Universitario de la Princesa; Instituto de Investigación Sanitaria Princesa (IP); Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD); Madrid; Spain