1. Center for Pediatric Oncology and Hematology; Children's Hospital; Vilnius University Hospital Santaros Klinikos; Vilnius Lithuania
2. 1st Department of Pediatrics; Hippokration General Hospital; Aristotle University of Thessaloniki; Thessaloniki Greece
3. Sackler Faculty of Medicine; Tel Aviv University; Tel Aviv Israel
4. The Israeli National Hemophilia Center and Thrombosis Unit; Sheba Medical Center; Tel Hashomer Israel
5. The Amalia Biron Research Institute of Thrombosis and Hemostasis; Sheba Medical Center; Tel Hashomer Israel
6. Novo Nordisk A/S; Søborg Denmark
7. Center for Bleeding and Clotting Disorders; Children's Hospital Minnesota; Minneapolis MN USA