1. Department of Molecular Medicine and Surgery, Stockholm, Sweden
2. Clinical Epidemiology Unit, Department of Medicine Solna, Stockholm, Sweden
3. Unit of Biostatistics, Institute of Environmental Medicine, Stockholm, Sweden
4. Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden
5. Center for Digestive Disease, Division of Coloproctology, Karolinska University Hospital, Stockholm, Sweden
6. Center for Digestive Disease, Division of Hepatology, Karolinska University Hospital, Stockholm, Sweden
7. Department of Pediatric Gastroenterology and Nutrition, Sachs’ Children’s Hospital, Stockholm, Sweden
8. Division of Surgery, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden
9. Department of Surgery, County Council of Östergötland, Linköping, Sweden