1. Clinic of Children's Diseases, Vilnius University and Centre for Pediatric Hematology/Oncology; Children's Hospital, Vilnius University Hospital Santariskiu Klinikos; Vilnius; Lithuania
2. Division of Haematology; Department of Paediatrics; Aarhus University Hospital; Skejby; Denmark
3. Department of Biochemistry; Centre for Haemophilia and Thrombosis; Aarhus University Hospital; Skejby; Denmark