1. Goethe University, University Hospital, Department of Paediatrics and Adolescent Medicine, Clinical and Molecular Haemostasis, 60590 Frankfurt, Germany
2. Department of Paediatric Haematology, Birmingham Children’s Hospital, Birmingham B4 6NH, UK
3. Hematology Department, Hospital Universitario La Paz-IdiPaz, Autónoma University, 28046 Madrid, Spain
4. Department of Paediatric Hematology, University Hospital and Masaryk University Brno, 601 77 Brno, Czech Republic