1. Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, Stockholm, Sweden
2. Clinical Epidemiology Unit, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden
3. Gastroenterology Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
4. Division of Surgery, Department of Clinical and Experimental Medicine, Faulty of Health Sciences, Linköping University and Department of Surgery, County Council of Östergötland Linköping, Sweden
5. Department Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
6. Department of Pediatrics, Örebro University Hospital, Örebro University, Örebro, Sweden
7. Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
8. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
9. Center for Digestive Disease, Division of Coloproctology, Karolinska University Hospital, Stockholm, Sweden
10. Department of Pediatric gastroenterology and Nutrition, Sachs’ Children and Youth Hospital, Stockholm, Sweden