1. Département de Médecine sociale et préventive, Université de Montréal, Montréal, Québec, Canada
2. Department of Epidemiology and Biostatistics, McGill University, Montréal, Québec, Canada
3. International Agency for Research on Cancer, Lyon, France
4. INRS-Institut Armand-Frappier, Laval, Québec, Canada
5. Division of Clinical Epidemiology, German Cancer Research Center, Heidelberg, Germany