1 Health Information Research Unit, Department of Clinical Epidemiology and Biostatics, McMaster University, Hamilton, Canada.
2 St. Michaels Hospital, Toronto, Canada.
3 Canadian Haemophilia Society, Montreal, Canada.
4 Health Information Research Unit, Department of Clinical Epidemiology and Biostatics, McMaster University, Hamilton, Canada Division of Hematology, Department of Medicine, Hamilton, Canada.
5 Division of Hematology, Department of Medicine, Hamilton, Canada.