1. Stem Cell Transplant Unit; “Aghia Sophia” Children's Hospital, Thivon and Levadias; “G. Genimmatas” General District Hospital, Athens, Greece
2. Department of Cardiology, Onassis Cardiac Surgery Center; “G. Genimmatas” General District Hospital, Athens, Greece
3. Department of Nuclear Medicine, Onassis Cardiac Surgery Center; “G. Genimmatas” General District Hospital, Athens, Greece
4. Immunology Department and National Histocompatibility Center; “G. Genimmatas” General District Hospital, Athens, Greece