Affiliation: | 1. Swiss Childhood Cancer Registry, Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland;2. Department of Health Sciences and Health Policy, University of Lucerne, Lucerne, Switzerland;3. Departement of Pediatric Hematology‐Oncology, Bern University Hospital, Bern, Switzerland;4. Department of Pediatrics, University Hospital of Geneva, Geneva, Switzerland |