1. Department of Pediatrics; Kuopio University Hospital; Kuopio Finland
2. Coagulation Disorders Unit; Department of Hematology and Cancer Center; Helsinki University Central Hospital; University of Helsinki; Helsinki Finland
3. Department of Pediatrics; Tampere University Central Hospital; Tampere Finland
4. Department of Pediatrics and Adolescent Medicine; Turku University Central Hospital; Turku Finland
5. Department of Pediatrics and Adolescence; Oulu University Hospital; Oulu Finland
6. Children's Hospital; Helsinki University Central Hospital; Helsinki Finland