[1] Univ Duisburg Essen, Univ Hosp Essen, Dept Hematol, West German Canc Ctr, Essen, Germany
[2] Fdn IRCCS Ca Granda Osped Maggiore Policlin, Milan, Italy
[3] Haukeland Hosp, Sect Hematol, Dept Med, Bergen, Norway
[4] Saitama Med Univ Hosp, Ctr Thrombosis & Hemostasis, Saitama, Japan
[5] Harvard Med Sch, Massachusetts Gen Hosp, Div Hematol, Boston, MA 02115 USA
[6] Sanofi, Cambridge, MA USA
[7] Univ Southern Calif, Keck Sch Med, Jane Anne Nohl Div Hematol, Dept Med, Los Angeles, CA 90007 USA