[1] Univ Colorado, Sch Med, Dept Pediat, Sect Hematol Oncol, Aurora, CO 80045 USA
[2] Univ Colorado, Sch Med, Hemophilia & Thrombosis Ctr, Aurora, CO USA
[3] Childrens Hosp Colorado, Aurora, CO USA
[4] CHOC Childrens Specialists, Div Hematol, Orange, CA USA
[5] Univ Penn, Childrens Hosp Philadelphia, Sch Med, Dept Pediat,Div Hematol, Philadelphia, PA 19104 USA
[6] Royal Hosp Sick Children, Dept Haematol, Glasgow, Lanark, Scotland
[7] Emma Childrens Hosp, Acad Med Ctr, Dept Pediat Haematol, Amsterdam, Netherlands
[8] McMaster Univ, Dept Pediat, Div Hematol Oncol, Hamilton, ON, Canada
[9] Johns Hopkins Univ, Sch Med, Dept Pediat, Div Hematol, Baltimore, MD 21205 USA
[10] Johns Hopkins All Childrens Hosp, Johns Hopkins Med Pediat Thrombosis Program, St Petersburg, FL USA
[11] Johns Hopkins Childrens Ctr, Baltimore, MD USA
[12] Johns Hopkins All Childrens Hosp, All Childrens Res Inst, St Petersburg, FL USA