1. Department of Paediatric Surgery , Skåne University Hospital and Department of Clinical Sciences, Paediatrics, Lund University , Lund , Sweden
2. Department of Paediatric Surgery, Oslo University Hospital and University of Oslo , Oslo , Norway
3. Division of Occupational and Environmental Medicine, Lund University , Lund , Sweden
4. Department of Surgery, Pelvic Floor Centre Malmö, Skåne University Hospital and Lund University , Malmö , Sweden
5. Division of Paediatric and Adolescent Medicine, Department of Child and Adolescent Mental Health in Hospitals, Oslo University Hospital , Oslo , Norway
6. Pelvic Floor Centre, Department of GI Surgery, Akershus University Hospital and University of Oslo , Oslo , Norway