[1] Imperial Coll London, Dept Epidemiol & Biostat, London, England
[2] Imperial Coll Sch Med, London, England
[3] Oslo Univ Hosp, Dept Obstet & Gynaecol, Oslo, Norway
[4] Kuopio Univ Hosp, Dept Obstet & Gynaecol, Kuopio, Finland
[5] St Thomas Hosp, Dept Physiotherapy, London, England
[6] DKD Wiesbaden, Dept Gynecol, Wiesbaden, Germany
[7] Univ Calif San Diego, Dept Female Pelv Med & Reconstruct Surg, San Diego, CA USA
[8] Kings Coll London, Dept Urogynaecol, London, England
[9] Charles Univ Prague, Dept Obstet & Gynecol, Plzen, Czech Republic
[10] Univ Leicester, Dept Urogynaecol, Leicester LE1 7RH, Leics, England