[1] Duke Univ, Med Ctr, Womens Hemostasis & Thrombosis Clin, Durham, NC 27710 USA
[2] Royal Free Hosp, London NW3 2QG, England
[3] Katharine Dormandy Haemophilia Ctr, London, England
[4] Maggiore Hosp, IRCCS, Dept Internal Med, Angelo Bianchi Bonomi Hemophilia & Thrombosis Ctr, Milan, Italy
[5] Univ Milan, Milan, Italy
[6] Mary M Gooley Hemophilia Treatment Ctr, Rochester, NY USA
[7] Univ Rochester, Sch Med, Rochester, NY USA