[1] Tulane Univ, Louisiana Ctr Bleeding & Clotting Disorders, Sch Med, New Orleans, LA 70112 USA
[2] Tulane Univ, Dept Biostat, Sch Publ Hlth, New Orleans, LA 70112 USA
[3] Childrens Hosp Michigan, Hemostasis Thrombosis Treatment Ctr, Detroit, MI USA
[4] Univ Texas Houston, Gulf States Hemophilia & Thrombophilia Ctr, Houston, TX USA