1. Second Department of Pediatrics; AHEPA University General Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
2. Institute of Pharmaceutical Biology; Goethe-University of Frankfurt; Frankfurt am Main Germany
3. Department of Pediatric Hematology and Oncology; Center for Bone Marrow Transplantation; Infectious Disease Research Program; University Childrens Hospital; Muenster Germany