Molecular Mechanisms and Biomarkers Group, International Agency for Research on Cancer, F69372, Lyon, France.|Epigenetic Group, International Agency for Research on Cancer, F69372, Lyon, France.|Molecular Mechanisms and Biomarkers Group, International Agency for Research on Cancer, F69372, Lyon, France.|Biostatistics Group, International Agency for Research on Cancer, F69372, Lyon, France.|Biostatistics Group, International Agency for Research on Cancer, F69372, Lyon, France.|Epigenetic Group, International Agency for Research on Cancer, F69372, Lyon, France.|Molecular Mechanisms and Biomarkers Group, International Agency for Research on Cancer, F69372, Lyon, France.|Molecular Mechanisms and Biomarkers Group, International Agency for Research on Cancer, F69372, Lyon, France. olivierm@iarc.fr.