1. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York
2. Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, Minnesota, and the Department of Nutrition, University of Oslo, Oslo, Norway
3. Institut National de la Santé et de la Recherche Médicale and Unité Mixte de Recherche S707, Universite Pierre et Marie Curie-Paris6, Paris, France