[1] Khon Kaen Univ, Dept Obstet & Gynaecol, Fac Med, Khon Kaen, Thailand
[2] Univ Fed Parana, Dept Obstet & Gynecol, Curitiba, Parana, Brazil
[3] Iberoamer Cochrane Ctr, CIBER Epidemiol & Salud Publ CIBERESP, Biomed Res Inst St Pau IIB St Pau, Barcelona, Spain
[4] Semear Fertilidade, Reprod Med, Ribeirao Preto, Brazil
[5] Univ Auckland, Dept Obstet & Gynaecol, Auckland, New Zealand