[1] Univ Copenhagen, Dept Publ Hlth, Sect Social Med, Copenhagen K, Denmark
[2] Copenhagen Univ Hosp, Rigshosp, Fertil Clin, Copenhagen, Denmark
[3] Univ Copenhagen, Dept Publ Hlth, Sect Epidemiol, Copenhagen K, Denmark
[4] Univ Copenhagen, Dept Publ Hlth, Sect Biostat, Copenhagen K, Denmark
[5] Bispebjerg Hosp, Dept Occupat & Environm Med, Copenhagen NV, Denmark
[6] Copenhagen Univ Hosp, Dept Breast Surg, Rigshosp, Copenhagen, Denmark