1. Department of Health Sciences and Health Policy; University of Lucerne; Lucerne Switzerland
2. Division of Pediatric Hematology/Oncology; Department of Pediatrics; University of Bern; Bern Switzerland
3. Division of Hematology/Oncology; University Children's Hospital Basel (UKBB); University of Basel; Basel Switzerland
4. Division of Hematology/Oncology; McMaster Children's Hospital & McMaster University; Hamilton ON Canada
5. Institute of Social and Preventive Medicine; University of Bern; Bern Switzerland