[1] Fdn IRCCS Ist Nazl Tumori Milano, Pediat Oncol Unit, Milan, Italy
[2] Univ Hosp Cruces, Barakaldo Bizkaia, Spain
[3] Ctr Hosp Univ, Pediat Hematol Oncol Dept, St Denis De La Reunion, France
[4] Univ Med Ctr, Ljubljana, Slovenia
[5] IRCCS Fdn Ca Granda Maggiore Hosp Policlin, Med Oncol Unit, Milan, Italy
[6] Dortmund Municipal Hosp, Pediat Clin, Dortmund, Germany
[7] Marciniak Hosp, Dept Pediat Surg, Wroclaw, Poland
[8] Med Univ, Dept Pediat Hematol & Oncol, Gdansk, Poland
[9] Univ Hosp Tuebingen, Dept Dermatol, Tubingen, Germany
[10] St Jude Childrens Res Hosp, Dept Oncol, 332 N Lauderdale St, Memphis, TN 38105 USA
[11] PSL Univ, SIREDO Oncol Ctr Care Innovat & Res Children Adol, Inst Curie, Paris, France
[12] Padova Univ Hosp, Hematol Oncol Div, Dept Womens & Childrens Hlth, Padua, Italy
[13] Eberhard Karls Univ Tubingen, Childrens Hosp, Pediat Hematol & Oncol, Tubingen, Germany