[1] Univ Copenhagen, Rigshosp, Dept Ob Gyn, Copenhagen, Denmark
[2] Univ Copenhagen, Rigshosp, Fertil Clin, Copenhagen, Denmark
[3] THL Finnish Inst Hlth & Welf, Informat Serv Dept, Helsinki, Finland
[4] Univ Copenhagen, Rigshosp, Dept Gynaecol, Copenhagen, Denmark
[5] Norwegian Univ Sci & Technol, Cent Norway Reg Hlth Author, Dept Publ Hlth & Gen Practice, Oslo, Norway
[6] Univ Gothenburg, Sahlgrenska Acad, Inst Clin Sci, Dept Obstet & Gynecol, Gothenburg, Sweden
[7] Univ Helsinki, Helsinki Univ Hosp, Dept Obstet & Gynecol, Helsinki, Finland
[8] Norwegian Univ Sci & Technol, Cent Norway Reg Hlth Author, Dept Publ Hlth & Gen Practice, Spiren Fertil Clin, Oslo, Norway
[9] Univ Tampere, Tampere Univers, Univ Helsinki,Helsinki Univ Hosp,Med & Clin Genet, Inst Mol Med,Fac Med & Hlth Technol,Inst Life Sci, Tampere, Finland
[10] Univ Copenhagen, Dept Biostat, Copenhagen, Denmark