[1] Pontificia Univ Catolica Chile, Fac Med, Sch Med, CMPL,Dept Obstet,Div Obstet & Gynaecol, Santiago, Chile
[2] Univ Antofagasta, Fac Ciencias Salud, Dept Biomed, Antofagasta, Chile
[3] Univ Valparaiso, Escuela Med, Vina Del Mar, Chile
[4] Hosp San Juan Dios, Gynaecol & Obstet Serv, Santiago, Chile
[5] Univ Seville, Fac Pharm, Dept Physiol, Seville, Spain
[6] Univ Queensland, Fac Med & Biomed Sci, UQCCR, Brisbane, Qld, Australia