1. Department of Gastroenterology, Faculty of Medicine and Health Örebro University Örebro Sweden
2. Clinical Epidemiology Division, Department of Medicine Solna Karolinska Institutet Stockholm Sweden
3. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
4. Division of Gastroenterology, Department of Specialist Medicine Danderyd Hospital Stockholm Sweden
5. Department of Clinical Science and Education Södersjukhuset Karolinska Institutet Stockholm Sweden
6. Gastroenterology Unit, Department of Gastroenterology, Dermatovenereology and Rheumatology Karolinska University Hospital Stockholm Sweden
7. Department of Clinical Sciences Danderyd University Hospital, Karolinska Institutet Stockholm Sweden
8. Department of Paediatrics Örebro University Hospital Örebro Sweden
9. Division of Digestive and Liver Disease, Department of Medicine Columbia University Medical Center New York New York USA
10. Sachs' Children and Youth Hospital Stockholm South General Hospital Stockholm Sweden