[1] Brighton & Sussex Univ Hosp NHS Trust, Royal Sussex Cty Hosp, Dept Obstet & Gynecol, Brighton BN2 5BE, E Sussex, England
[2] Brighton & Sussex Med Sch, Brighton BN2 5BE, E Sussex, England
[3] Medway Maritime Hosp, Medway Hosp NHS Trust, Dept Obstet & Gynecol, Gillingham, Kent, England
[4] Univ Kent, Canterbury, Kent, England
[5] Univ Greenwich, London, England
[6] Arabian Gulf Univ, Coll Med & Med Sci, Dept Obstet & Gynecol, Manama, Bahrain
[7] Univ Warwick, South Warwickshire NHS Fdn Trust, Coventry, W Midlands, England
[8] Univ New Mexico Hosp, Womens Pelv Specialty Care PC, Albuquerque, NM USA
[9] Univ Buenos Aires, Fac Med, Buenos Aires, DF, Argentina
[10] King Khalid Univ Hosp, Dept Obstet & Gynecol, Riyadh, Saudi Arabia
[11] King Saud Univ, Coll Med, Riyadh, Saudi Arabia
[12] Charles Univ Prague, Dept Obstet & Gynecol, Prague, Czech Republic
[13] Genesis Hlth Syst, Zanesville, OH USA
[14] Hampshire Hosp NHS Fdn Trust, Dept Obstet & Gynecol, Basingstoke, Hants, England