[1] Cambridge Univ Hosp NHS Fdn Trust, Cambridge, England
[2] Childrens Canc Res Inst, Vienna, Austria
[3] Univ Anna Meyer, Florence, Italy
[4] Hosp Univ Cruces, Bilbao, Spain
[5] Hosp Nacl Pediat J Garrahan, Buenos Aires, DF, Argentina
[6] Hop Trousseau, Paris, France
[7] Karolinska Inst, Stockholm, Sweden
[8] Univ Klinikum Hamburg Eppendorf, Hamburg, Germany
[9] Texas Childrens Canc & Hematol Ctr, Houston, TX USA
[10] Hosp Sick Children, Toronto, ON, Canada
[11] Sir James Spence Inst, Newcastle Upon Tyne, Tyne & Wear, England
[12] Childrens Natl Med Ctr, Washington, DC USA