[1] MediClin Panorama, ZA-7500 Cape Town, South Africa
[2] Univ Stellenbosch, Dept Obstet & Gynecol, Cape Town, South Africa
[3] Tel Aviv Univ, Sackler Fac Med, IL-69978 Tel Aviv, Israel
[4] Queen Charlottes & Chelsea Hosp, London W6 0XG, England
[5] Chelsea & Westminster Hosp, London, England
[6] Pisa Univ Hosp, Dept Obstet & Gynecol, Pisa, Italy
[7] Eastern Virginia Med Sch, Jones Inst, Norfolk, VA 23501 USA
[8] Univ Sydney, Sydney Med Sch, Sydney, NSW 2006, Australia
[9] Monash Univ, Dept Epidemiol & Prevent Med, Sch Publ Hlth & Prevent Med, Melbourne, Vic 3004, Australia
[10] Univ Paris 05, UF Gynecol, AP HP, Hotel Dieu, Paris, France
[11] Stanford Univ, Dept Hlth Res & Policy Epidemiol, Stanford, CA 94305 USA
[12] Stanford Univ, Dept Neurol & Neurol Sci, Stanford, CA 94305 USA
[13] Univ Nevada, Sch Med, Las Vegas, NV 89154 USA
[14] Columbia Univ, Dept Obstet & Gynecol, New York, NY USA
[15] Hop Hotel Dieu, Unite Gynecol Med, Paris, France
[16] Solihull Hosp, Heart England NHS Fdn Trust, Birmingham, W Midlands, England