Institution: | 1.National Institute for Health and Welfare,Oulu,Finland;2.Department of Cancer Epidemiology,German Cancer Research Centre,Heidelberg,Germany;3.Department of Medical Biosciences,Ume? University,Ume?,Sweden;4.Tampere School of Public Health,University of Tampere,Tampere,Finland;5.Department of Obstetrics and Gynaecology,New York University School of Medicine,New York,USA |