1. Department of Gastroenterology and Hepatology University Hospital Linköping Sweden
2. Department of Medicine Solna Karolinska Institutet Stockholm Sweden
3. Department of Health, Medicine and Caring Sciences Linköping University Linköping Sweden
4. Division of Surgery Department of Biomedical and Clinical Sciences Faculty of Health Sciences Linköping University Linköping Sweden
5. Department of Surgery University Hospital Linköping Sweden
6. Clinical Epidemiology Division Department of Medicine Solna Karolinska Institutet Stockholm Sweden
7. Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet Stockholm Sweden
8. Division of Gastroenterology Medical Unit Gastroenterology, Dermatovenereology and Rheumatology Karolinska University Hospital Stockholm Sweden
9. Department of Medical Epidemiology and Biostatistics Karolinska Institutet Stockholm Sweden
10. Department of Pediatrics Örebro University Hospital Örebro Sweden
11. Division of Epidemiology and Public Health School of Medicine University of Nottingham Nottingham UK
12. Department of Medicine Columbia University College of Physicians and Surgeons New York New York USA