[1] Georgetown Univ, Med Ctr, Div Hematol Oncol, Lombardi Comprehens Canc Ctr, Washington, DC 20007 USA
[2] Univ Wales Hosp, Arthur Bloom Haemophilia Ctr, Cardiff, Wales
[3] Coagulat Lab, Hamburg, Germany
[4] Mangiagalli Regina Elena & Univ Milan, Angelo Bianchi Bonomi Hemophilia & Thrombosis Ctr, Fdn Maggiore Policlin Hosp,IRCCS, Dept Internal Med & Dermatol, Milan, Italy