1. Faculty of Health Sciences and Medicine, University of Lucerne, Lucerne, Switzerland
2. Department of Paediatrics, Obstetrics and Gynaecology, Division of Paediatric Haematology and Oncology, University Hospital of Geneva, Geneva, Switzerland
3. Paediatric Haematology/Oncology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland