[1] Univ London Imperial Coll Sci Technol & Med, Dept Epidemiol, London SW7 2AZ, England
[2] Univ London Imperial Coll Sci Technol & Med, Dept Biostat, London SW7 2AZ, England
[3] Univ London Imperial Coll Sci Technol & Med, Dept Urogynecol, London SW7 2AZ, England
[4] Univ London Imperial Coll Sci Technol & Med, Dept Genom Common Dis & Mol Genet & Genom, London SW7 2AZ, England
[5] Univ London Imperial Coll Sci Technol & Med, Clin Trials Unit, London SW7 2AZ, England
[6] Univ London Imperial Coll Sci Technol & Med, Inst Reprod & Dev Biol, London SW7 2AZ, England
[7] Kings Coll London, Dept Urogynecol, London, England
[8] UCL, Sch Med, London W1N 8AA, England
[9] Univ Sheffield, Dept Urol Res, Sheffield, S Yorkshire, England
[10] Univ Warwick, Warwick Med Sch, Div Hlth Sci, Coventry CV4 7AL, W Midlands, England
[11] Univ Glasgow, Beatson Inst Canc Res, Glasgow, Lanark, Scotland
[12] Univ Calif San Diego, Dept Reprod Med, San Diego, CA 92103 USA
[13] Kaiser Permanente, Dept Obstet & Gynecol, San Diego, CA USA
[14] Univ Helsinki, Cent Hosp, Dept Urol, Helsinki, Finland
[15] Univ Helsinki, Cent Hosp, Dept Publ Hlth, Helsinki, Finland
[16] Univ Helsinki, Helsinki, Finland
[17] Univ Tampere, Dept Urol, FIN-33101 Tampere, Finland
[18] Univ Oulu, Inst Hlth Sci, SF-90100 Oulu, Finland
[19] Univ Oulu, Bioctr Oulu, SF-90100 Oulu, Finland
[20] McMaster Univ, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada