[1] IRCCS Ca Granda Fdn Maggiore Policlin Hosp, Via M Fanti 6, I-20122 Milan, Italy
[2] Middle East Fertil Soc Journal, Cairo, Egypt
[3] Ctr Human Reprod, Div Labs, New York, NY USA
[4] UCL, Res Dept Genet Evolut & Environm, London, England
[5] Univ Aberdeen, Aberdeen Matern Hosp, Reprod Med, Sch Med & Dent, Foresterhill, Aberdeen, Scotland
[6] Univ Aberdeen, Aberdeen Matern Hosp, Div Appl Hlth Sci, Sch Med & Dent, Foresterhill, Aberdeen, Scotland
[7] Univ Aberdeen, Aberdeen Matern Hosp, Inst Appl Hlth Sci, Sch Med & Dent, Foresterhill, Aberdeen, Scotland
[8] 110 Rue Nelson Mandela, F-74160 St Julien En Genevois, France
[9] Maastricht Univ, Med Ctr, Dept Obstet & Gynaecol, Maastricht, Netherlands
[10] Maastricht Univ, Dept Genet & Cell Biol, Maastricht, Netherlands
[11] Univ Edinburgh, Simpson Ctr Reprod Hlth, Edinburgh EH8 9YL, Midlothian, Scotland
[12] Univ Glasgow, MRC CSO Social & Publ Hlth Sci Unit, Glasgow, Lanark, Scotland
[13] Univ Aberdeen, Sci Director Immpact, Hlth Sci Bldg,Foresterhill, Aberdeen, Scotland
[14] Univ Milan, Dept Clin Sci & Community Hlth, Milan, Italy
[15] Austrian Acad Sci, Mortal Res Grp, Vienna Onstitute Demog, Vienna, Austria
[16] Univ Lausanne, Fac Biol & Med, Sch & Adolescent Hlth & Med Educ, Bussigny, Switzerland
[17] IRCCS Ist Ric Farmacol Mario Negri, Dept Epidemiol, Milan, Italy
[18] Univ Oxford, Epidemiol, George Inst Global Hlth, Nuffield Dept Populat Hlth,Oxford Martin Sch, Oxford, England
[19] UN City, Div Noncommunicable Dis & Life Course, Violence & Injury Prevent, Copenhagen, Denmark
[20] Univ Edinburgh, Ctr Reprod Biol, Edinburgh EH8 9YL, Midlothian, Scotland
[21] Vrije Univ Brussel, Univ Ziekenhuis, Ctr Reprod Med, Brussels, Belgium
[22] Univ Klinikum Schleswig Holstein, Klin Frauenheilkunde & Geburtshilfe, Campus Lubeck, Lubeck, Germany
[23] Liverpool Womens Hosp, Dept OB GYN, Liverpool, Merseyside, England
[24] Kings Coll London, Sch Biomed & Hlth Sci, Reprod & Rhythms Grp, London WC2R 2LS, England
[25] SISMER, Reprod Med Unit, Bologna, Italy
[26] Sahlgrens Univ Hosp, Reprod Med, Gothenburg, Sweden
[27] Univ Trondheim, Dept Obstet & Gynaecol, N-7034 Trondheim, Norway
[28] Univ Helsinki, Dept Obstet & Gynaecol, Helsinki Univ Hosp, Helsinki, Finland
[29] Univ Oulu, Dept Obstet & Gynaecol, Oulu Univ Hosp, Oulu, Finland
[30] Med Res Ctr Oulu, Oulu, Finland
[31] Aristotle Univ Thessaloniki, Human Reprod Unit, Dept Obstet & Gynaecol 1, Sch Med, Thessaloniki, Greece
[32] Vrije Univ Brussel, Univ Ziekenhuis, Ctr Reprod Med, Brussels, Belgium
[33] R D Hosp Univ Quiron Dexeus, Barcelona, Spain
[34] Univ Modena, Dipartimento Integrato Materno Infantile, I-41100 Modena, Italy