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Aarhus Univ, Dept Publ Hlth, Epidemiol Sect, Bartholins Alle 2, DK-8000 Aarhus C, Denmark
WHO Collaborating Ctr Res Human Reprod, Dept Epidemiol & Social Sci Reprod Hlth, Shanghai Inst Planned Parenthood Res, Natl Populat & Family Planning Key Lab Contracept, Shanghai, Peoples R China Aarhus Univ, Dept Publ Hlth, Epidemiol Sect, Bartholins Alle 2, DK-8000 Aarhus C, Denmark