1. Department of Stem Cell Transplantation University Medical Center Hamburg‐Eppendorf Hamburg Germany
2. Hematology and Bone Marrow Transplantation Unit San Raffaele Scientific InstituteVita‐Salute San Raffaele University Milano Italy
3. Institute for Medical Microbiology, Virology and Hygiene University Medical Center Hamburg‐Eppendorf Hamburg Germany
4. German Center for Infection Research (DZIF) Partner Site Hamburg‐Borstel‐Lübeck Hamburg Germany
5. Department of Neuroradiology University Medical Center Hamburg‐Eppendorf Hamburg Germany
6. Department of Neurology University Medical Center Hamburg‐Eppendorf Hamburg Germany