[1] Childrens Hosp Los Angeles, Div Adolescent & Young Adult Med, Los Angeles, CA 90027 USA
[2] Vanderbilt Univ, Dept Pathol Microbiol & Immunol, Med Ctr, Nashville, TN USA
[3] Texas Childrens Hosp, Dept Pediat & Adolescent Gynecol, Houston, TX 77030 USA
[4] Univ Rochester, Rochester Gen Hosp, Dept Hematol & Med Oncol, Sch Med, Rochester, NY USA
[5] Mary M Gooley Hemophilia Treatment Ctr, Rochester, NY USA
[6] Childrens Hosp Los Angeles, Saban Res Inst Biostat Core, Los Angeles, CA 90027 USA
[7] Oregon Hlth & Sci Univ, Div Hematol & Oncol, Portland, OR 97201 USA
[8] Maine Med Ctr, Dept Obstet & Gynecol, Portland, ME 04102 USA
[9] Univ Michigan, Dept Pediat, Div Hematol & Oncol, Med Sch, Ann Arbor, MI USA
[10] Oregon Hlth & Sci Univ, Dept Obstet & Gynecol, Portland, OR 97201 USA
[11] Univ Southern Calif, Keck Sch Med, Div Adolescent & Young Adult Med, Los Angeles, CA 90007 USA