1. Second Department of Pediatrics, “Aghia Sophia” Children’s Hospital, 115 27 Athens, Greece
2. Department of Pediatrics, University General Hospital of Alexandroupolis, 681 00 Alexandroupolis, Greece
3. Department of Orthopaedics and Traumatology, “251” Hellenic Air Force General Hospital of Athens, 115 25 Athens, Greece
4. Department of Medicine, University of Crete, 715 00 Heraklion, Greece
5. First Department of Medical Oncology, “Metropolitan” Hospital, 185 47 Attica, Greece