[1] Mayo Clin, Mayo Clin Thrombophilia Ctr, Rochester, MN 55905 USA
[2] Ctr Dis Control & Prevent, Div Blood Disorders, NCBDDD, Atlanta, GA USA
[3] Univ Michigan, Hemophilia & Coagulat Disorders Program, Ann Arbor, MI 48109 USA
[4] UNC, Thrombophilia Program, Chapel Hill, NC USA
[5] Michigan State Univ, Comprehens Ctr Bleeding Disorders, E Lansing, MI 48824 USA
[6] Mt States Reg Hemophilia & Thrombosis Ctr, Aurora, CO USA
[7] Duke Univ, Med Ctr, Duke Hemostasis & Thrombosis Ctr, Durham, NC USA
[8] Univ Med & Dent New Jersey, Robert Wood Johnson Med Sch, Thrombosis Ctr, New Brunswick, NJ USA