[1] IRCCS, Ist Giannina Gaslini, Epidemiol & Biostat Unit, Genoa, Italy
[2] European Soc Paediat Oncol SIOPE, Brussels, Belgium
[3] Interuniv Consortium Cineca, Casalecchio Di Reno, BO, Italy
[4] Emma Childrens Hosp, Acad Med Ctr, Dept Paediat Oncol, Amsterdam, Netherlands
[5] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[6] PanCare, Oxford, England
[7] Inst Oncol, Dept Radiat Oncol, Ljubljana, Slovenia
[8] Ist Giannina Gaslini, Dept Hematol & Oncol, Genoa, Italy
[9] Austrian Childhood Canc Org, CCI, Vienna, Austria
[10] Great North Childrens Hosp, Royal Victoria Infirm, Childrens BMT Unit, Dept Paediat & Adolescent Haematol & Oncol, Newcastle Upon Tyne, Tyne & Wear, England
[11] Clin Hosp Ctr Rijeka, Dept Pediat, Div Hematol & Oncol, Rijeka, Croatia
[12] Great Ormond St Hosp Sick Children, Dept Haematol Oncol, Great Ormond St, London, England
[13] Christian Albrechts Univ Kiel, Dept Paediat, Kiel, Germany
[14] Univ Med Ctr Schleswig Holstein, Kiel, Germany
[15] Lund Univ, Skane Univ Hosp, Dept Clin Sci Lund, Paediat, Lund, Sweden
[16] St Anna Childrens Canc Res Inst, Vienna, Austria