1. Department for Haematopoietic Transplantations, University Hospital of Munich, Munich, Germany;
2. Department for pediatric Haematology and Oncology, University Hospital of Düsseldorf, Düsseldorf, Germany;
3. Municipal Hospital Oldenburg, Oldenburg, Germany;
4. Helmholtz Center, Munich, Clinical cooperative group Human Cell Transplantation (CCG-HCT), Munich, Germany;
5. Municipal Hospital Augsburg, Augsburg, Germany