1European Institute of Oncology, Milan, Italy, 2University of L'Aquila, L'Aquila, Italy, 3Erasmus MC University Medical Center, Rotterdam, the Netherlands, 4Brigham and Women's Hospital and Harvard Medical School, Boston, MA, U.S.A., 5German Cancer Research Center, Heidelberg, Germany,6Leiden University Medical Center, Leiden, the Netherlands, 7Institute of Forensic Research, Krakow, Poland, 8Murdoch Children's Research Institute, Royal Children's Hospital, Vic., Australia, 9Menzies Research Institute Tasmania, University of Tasmania, Hobart, Tas., Australia, 10Oslo University Hospital, Oslo, Norway, 11International Prevention Research Institute, Lyon, France, 12University of Murcia, Murcia, Spain, 13Moffitt Cancer Center, Tampa, FL, U.S.A., 14National Cancer Institute, NIH, Bethesda, MD, U.S.A., 15University of Ottawa, Ottawa, ON, Canada,16Institute of Cancer and Pathology, University of Leeds, Leeds, U.K. and17UCL Institute of Child Health, London, U.K.