[1] Univ Warwick, Warwick Med Sch, Coventry, W Midlands, England
[2] Univ Coll London Hosp, Inst Womens Hlth, Reprod Med Unit, London, England
[3] Univ Granada, Dept Prevent Med & Publ Hlth, Granada, Spain
[4] Consortium Biomed Res Epidemiol & Publ Hlth CIBER, Madrid, Spain
[5] Inst Invest Biosanit Ibs GRANADA, Granada, Spain
[6] Univ Med Tirana, Dept Pharm, Tirana, Albania
[7] Monash Univ Melbourne, Monash Ctr Hlth Res & Implementat, Natl Hlth & Med Res Council Ctr Res Excellence PC, Melbourne, Vic, Australia
[8] Monash Univ, Monash Ctr Hlth Res & Implementat, Sch Publ Hlth, Clayton, Vic, Australia
[9] Imperial Coll, Hammersmith Hosp, Inst Reprod & Dev Biol, Sch Med, London, England
[10] Leeds Teaching Hosp NHS Trust, Seacroft Hosp, Leeds Fertil, Leeds, W Yorkshire, England
[11] Homerton Univ Hosp NHS Fdn Trust, London, England
[12] Queen Mary Univ London, Barts Res Ctr Womens Hlth BARC, Barts & London Sch Med & Dent, Womens Hlth Res Unit, London, England
[13] Univ Oulu, Oulu Univ Hosp, Med Res Ctr, Dept Obstet & Gynecol,PEDEGO Res Unit, Oulu, Finland
[14] Fdn Policlin Univ A Gemelli IRCCS, Dept Womens & Childrens Hlth, Rome, Italy
[15] Azienda Osped Card Panico, Dept Woman & Child Hlth, Tricase, Italy
[16] Erasmus MC, Dept Obstet & Gynecol, Div Reprod Endocrinol & Infertil, Rotterdam, Netherlands
[17] Verity, Surry, England
[18] Monash Univ, Dept Obstet & Gynaecol, Melbourne, Vic, Australia
[19] Univ Aberdeen, Aberdeen Ctr Womens Hlth Res, Aberdeen, Scotland
[20] Univ Birmingham, Inst Metab & Syst Res, Birmingham, W Midlands, England