1. Childhood Cancer Research Group, Institute of Social and Preventive Medicine University of Bern Bern Switzerland
2. Graduate School for Cellular and Biomedical Sciences University of Bern, Bern Switzerland
3. Division of Paediatric Oncology/Haematology, University Children's Hospital Basel University of Basel Basel Switzerland
4. Division of Paediatric Haematology and Oncology, University Children's Hospital Bern University of Bern Bern Switzerland
5. Center for Primary Care and Public Health (Unisanté) University of Lausanne Lausanne Switzerland