Division of Hematology/Oncology, The Hospital for Sick Children, Toronto and the Department of Pediatrics, University of Toronto, Ontario, Canada. victor.blanchette@sickkids.ca
A survey was conducted in 2002 to determine the pattern of factor prophylaxis use in boys or=45 weeks per year, was significantly higher for haemophilia A vs. haemophilia B cases (51% vs. 32%, P