[1] Newcastle upon Tyne Hosp NHS Fdn Trust, Dept Haematol, Newcastle Upon Tyne, Tyne & Wear, England
[2] Wayne State Univ, Sch Med, Carman & Ann Adams Dept Pediat, Div Hematol Oncol,Childrens Hosp Michigan, Detroit, MI USA
[3] Hosp Sick Children, Div Pediat Hematol Oncol, Toronto, ON, Canada
[4] Erasmus MC, Dept Pediat Hematol, Sophia Childrens Hosp, Rotterdam, Netherlands
[5] McMaster Univ, McMaster Childrens Hosp, Hamilton, ON, Canada
[6] Johns Hopkins Univ, Sch Med, Dept Pediat, Div Hematol, Baltimore, MD 21205 USA
[7] Johns Hopkins All Childrens Hosp, Johns Hopkins Med Pediat Thrombosis Program, St Petersburg, FL USA
[8] Johns Hopkins Childrens Ctr, Baltimore, MD USA