1. Coagulation Disorders Unit; Department of Hematology; Helsinki University Central Hospital; Helsinki Finland
2. HUSLAB Laboratory Services; Coagulation Disorders Unit and Clinical Chemistry; University of Helsinki; Helsinki Finland
3. Department of Pediatric Hematology and Oncology; University Medical Center Hamburg-Eppendorf; Hamburg Germany
4. Asklepios Clinic Altona; Medilys Laboratory; Hamburg Germany