1. Department of Paediatrics Örebro University HospitalÖrebro Sweden
2. Department of Medical Epidemiology and Biostatistics Karolinska InstitutetStockholm Sweden
3. Department of Epidemiology and Public Health University of NottinghamNottingham UK
4. School of Medicine University of TampereTampere Finland
5. Department of Internal Medicine, Hospital Tampere University HospitalTampere Finland
6. Department of Internal Medicine Seinäjoki Central HospitalSeinäjoki Finland
7. Department of Medicine C Bonorino Udaondo Gastroenterology Hospital Universidad del SalvadorBuenos Aires Argentina
8. Department of Medicine and Surgery University of SalernoSalerno Italy
9. Regional GI and Liver Unit, Royal Hallamshire HospitalSheffield UK
10. Department of Medicine Department of Immunology Mayo Clinic College of MedicineRochester USA