1. Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Department of Pediatric Oncology Sahlgrenska University Hospital, Region Västra Götaland Gothenburg Sweden
3. School of Public health and Community Medicine, Institute of Medicine, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
4. Department of Surgery, SSORG – Scandinavian Surgical Outcomes Research Group, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
5. Department of Surgery Sahlgrenska University Hospital, Region Västra Götaland Gothenburg Sweden