1. Infectious Disease Research Program, Center for Bone Marrow Transplantation and Department of Pediatric Hematology/Oncology, Children’s University Hospital Münster, 48149 Münster, Germany
2. 2nd Department of Pediatrics, Aristotle University of Thessaloniki, AHEPA Hospital, 54636 Thessaloniki, Greece
3. Department of Medical Microbiology, University Hospital Münster, 48149 Münster, Germany