Obstet Gynecol 2011 Nov;118(5):1029-1036
From the Division of Preventive Oncology, National Center for Tumor Diseases and German Cancer Research Center, Heidelberg, Germany; National Institute for Health and Welfare, Oulu, Finland; University of Tampere, Tampere, Finland; Department of Environmental Medicine, New York University School of Medicine, New York; New York University Cancer Institute, New York, New York; Department of Medical Biosciences, University of Umeå, Umeå, Sweden; Public Health and Clinical Medicine, Nutritional Research, University of Umeå, Umeå, Sweden; School of Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, Scotland; Division of Cancer Epidemiology, German Cancer Research Center, Heidelberg, Germany; Institute for Statistical and Epidemiological Cancer Research, Helsinki, Finland; Department of Obstetrics and Gynecology, New York University School of Medicine, New York, New York; Institute of Social and Preventive Medicine, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland.