1. 3rd Department of Pediatrics of University of Athens, “Attikon” University General Hospital
2. 1st Department of Pediatrics, ‘Panagiotis and Aglaia Kyriakou’ Children's Hospital
3. Haemophilia Centre/Haemostasis and Thrombosis Unit, “Aghia Sophia” Children's Hospital
4. 2nd Department of Pediatrics of University of Athens, Panagiotis and Aglaia Kyriakou Children's Hospital, Athens Greece