1. Department of Pediatrics; Democritus University of Thrace Faculty of Medicine; Alexandroupolis Thrace Greece
2. Department of Pediatric Hematology/Oncology; Dr von Haunersches Kinderspital; Ludwig-Maximilians-Universität; Munich Germany
3. Department of Immunology and Histocompatibility; Specialized & Referral Centre for Primary Immunodeficiencies-Pediatric Immunology; “Aghia Sophia” Children's Hospital; Athens Greece