International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr|International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr|International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr|International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr|International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr|International Agency for Research on Cancer, Lyon, France. voegele@iarc.fr