1. Department of Pediatric Oncology Astrid Lindgren Children's Hospital Karolinska University Hospital Stockholm Sweden
2. Department of Women's and Children's Health, Childhood Cancer Research Unit Karolinska Institutet Stockholm Sweden
3. Department of Women's and Children's Health Uppsala University Uppsala Sweden
4. Department of Pediatrics and Adolescent Medicine Aarhus University Hospital Aarhus Denmark
5. Department of Clinical Medicine, Faculty of Medicine University of Aarhus Aarhus Denmark
6. Department of Pediatrics and Adolescent Medicine Turku University Hospital, and Turku University Turku Finland
7. Department of Health Care Sciences, Palliative Research Centre Marie Cederschiöld University Stockholm Sweden