1. From the Department of Pediatric Oncology and Biostatistics and Epidemiology Unit, Institut Gustave-Roussy, Villejuif; Univ Paris-Sud, Le Kremlin-Bicêtre; Department of Pathology, Centre Hospitalier Universitaire Toulouse, Hôpital Purpan; L'Institut National de la Santé et de la Recherche Médicale, U563, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Department of Pediatrics, University Hospital, Padova, Italy; Department of Pediatrics, Addenbrookes Hospital, Cambridge, United Kingdom;...