1. Institute of Social and Preventive MedicineUniversity of Bern Bern Switzerland
2. Institute of Primary and Community Care Lucerne Switzerland
3. Department of Health Sciences and Health PolicyUniversity of Lucerne Lucerne Switzerland
4. Department of Psychosomatic Medicine, Division of Internal MedicineUniversity Hospital BaselBasel Switzerland
5. Department of Pediatric OncologyUniversity Children's Hospital ZurichZurich Switzerland
6. Division of Pediatric Hematology/OncologyUniversity Children's Hospital Inselspital Bern Switzerland