1. Department of Paediatrics; Kuopio University Hospital; Kuopio Finland
2. Coagulation Disorders Unit; Department of Hematology; Comprehensive Cancer Center; Helsinki University Hospital; University of Helsinki; Helsinki Finland
3. Department of Paediatrics; Tampere University Central Hospital; Tampere Finland
4. Children's Hospital; Helsinki University Hospital; Helsinki Finland
5. Finnish Red Cross Blood Transfusion Service; Helsinki Finland
6. Department of Clinical Sciences - Paediatrics and Paediatric Clinic and Malmö Centre for Thrombosis and Haemostasis; Skånes Universitetssjukhus; Lund University; Lund Sweden
7. Department of Paediatrics and Adolescent Medicine; Turku University Hospital and Turku University; Turku Finland
8. Research Unit for Pediatrics, Dermatology, Clinical Genetics, Obstetrics and Gynecology; University Hospital of Oulu; Oulu Finland