1Paediatric Haematology, Evelina Children's Hospital, Guy's and St Thomas' Hospital, London, United Kingdom
2Department of Women and Children, King's College London, London, United Kingdom
3Our Lady's Children's Hospital, Dublin, Paediatric Haematology, Dublin, Ireland
4Azienda Ospedaliera Universitaria, Padova, Italy
52Clinic of Pediatric Hematology-Oncology, Department of Child and Maternal Health, Padova, Italy
6Università degli studi della Campania Luigi Vanvitelli, Naples, ITA
7University of Padova, Department of Neurosciences, Padova, Italy
8Università della Campiana, Luigi Vanvitelli, Caserta, Italy
9SECOND UNIVERSITY OF NAPLES, NAPOLI, ITA
10Guy's and St Thomas NHS Trust, Ultrasound Angiology, London, United Kingdom