1. Survivorship Unit, Danish Cancer Society Research Center, Copenhagen, Denmark;
2. Department of Pediatrics & Adolescent Medicine, University Hospital Rigshospitalet, Copenhagen, Denmark;
3. Section of Environment and Radiation, International Agency for Research on Cancer (IARC), Lyon Cedex, France;
4. Unit of Statistics, Bioinformatics and Registry, Danish Cancer Society Research Center, Copenhagen, Denmark;
5. The Department of Oncology, University Hospital Rigshospitalet, Copenhagen, Denmark;
6. Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark