1. From the Department of Medicine, University of Western Australia, Thrombosis and Haemophilia Unit, Royal Perth Hospital, Perth, Australia (J.W.E.); Hamilton Civic Hospitals Research Centre, Hamilton, Canada (J.H., J.I.W.); the Department of Medicine, McMaster University, Hamilton, Canada (J.H., J.I.W., S.Y.); Hemostasis Reference Laboratory, Hamilton Civic Hospitals, Hamilton, Canada (M.J.); the Biostatistics Department, Princess Margaret Hospital, Toronto, Canada (Q.Y.); and Population Health...