1. Department of Pediatrics; Stem Cell Transplantation Unit; St Anna Children's Hospital; Medical University; Vienna; Austria
2. Department of Pediatrics; University Hospital; Tübingen; Germany
3. Oncology Unit; The Children's Hospital at Westmead; Sydney; Australia
4. Department of Pediatrics; Hadassah University Hospital; Jerusalem; Israel
5. Department of Virology; University Hospital; Basel; Switzerland
6. Department of Hematology; Hôpital Henri Mondor; Assistance Publique-Hôpitaux de Paris, and Université Paris-Est Créteil; Creteil; France
7. Department of Hematology; Karolinska University Hospital, and Department of Medicine Huddinge; Section of Hematology; Karolinska Institutet; Stockholm; Sweden