[1] Univ Inst Clin Res, Montpellier, France
[2] Univ Oxford, Dept Pediat, Oxford, England
[3] Univ Med Ctr, Dept Pediat Hematol & Oncol, Hamburg, Germany
[4] Univ Hosp, Registre Natl Tumeurs Solides Enfant, Nancy, France
[5] Fac Med, Registre Natl Tumeurs Solides Enfant, Nancy, France
[6] Hlth Sci Univ Hokkaido, Dept Fundamental Hlth Sci, Tobetsu, Japan
[7] Fdn IRCCS Ist Nazl Tumori, Pediat Unit, Milan, Italy
[8] Giannina Gaslini Childrens Res Hosp IRCCS, Neuro Oncol Unit, Genoa, Italy
[9] Registro Oncopediat Hosp Argentino, Buenos Aires, DF, Argentina
[10] Aarhus Univ, Hosp Skejby, Dept Pediat, Aarhus, Denmark
[11] Semmelweis Univ, Hungarian Pediat Canc Registry, Dept Pediat 2, H-1085 Budapest, Hungary
[12] Univ Toronto, Pediat Oncol Grp Ontario, Toronto, ON, Canada
[13] Univ Lausanne Hosp, Dept Pediat, Lausanne, Switzerland
[14] Univ Bern, Swiss Childhood Canc Registry, Bern, Switzerland
[15] Direcc Gen Salud Publ, Area Epidemiol, Valencia, Spain
[16] Valencia Childhood Canc Registry, Dept Epidemiol, Valencia, Spain
[17] Univ Valencia, Natl Childhood Canc Registry RNTI SEHOP, Valencia, Spain
[18] Med Univ Graz, Dept Pediat & Adolescent Med, Div Pediat Hematol & Oncol, Graz, Austria
[19] Hop Necker Enfants Malad, Serv Histol Embryol Cytogenet, INSERM U781, Paris, France
[20] Univ Paris 05, Paris, France
[21] Edith Cowan Univ, Sch Exercise Biomed & Hlth Sci, Perth, WA, Australia
[22] Vivantes Clin, Dept Pathol, Berlin, Germany