[1] Univ Med Greifswald, Pediat Hematol & Oncol, Greifswald, Germany
[2] Paris Sud Univ, Gustave Roussy, Children & Adolescent Oncol Dept, Paris, France
[3] Univ Southampton, Pediat Oncol, Southampton, Hants, England
[4] Fdn IRCCS Ist Nazl Tumori, Pediat Oncol, Milan, Italy
[5] Jagiellonian Univ, Coll Med, Pediat Hematol Oncol, Krakow, Poland
[6] Hosp Univ & Politecn La Fe, Pediat Oncol, Valencia, Spain
[7] Tel Aviv Univ, Sackler Fac Med, Schneider Childrens Med Ctr Israel, Petah Tiqwa, Israel
[8] Our Ladys Childrens Hosp Crumlin, Pediat Haematol Oncol, Dublin, Ireland
[9] Univ Hosp Ghent, Pediat Oncol, Ghent, Belgium
[10] Agia Sofia Childrens Hosp, Dept Pediat Hematol Oncol, Athens, Greece
[11] IRCCS Ist Giannina Gaslini, Oncol Unit, Genoa, Italy
[12] St Anna Kinderkrebsforsch, CCRI, Vienna, Austria