1. Department of General Paediatrics and Haematology/Oncology; University Hospital Tübingen, University Children's Hospital; Tübingen Germany
2. Cochrane Germany; Cochrane Germany Foundation; Freiburg Germany
3. Pediatric Hematology and Oncology Centre for Pediatrics and Adolescent Medicine; University Medical School Freiburg; Freiburg Germany
4. Department of Neonatology; University Hospital Zürich; Zürich Switzerland