[1] Hosp Univ Moraleja, Serv Obstet Ginecol, Madrid, Spain
[2] Hosp Univ Virgen Nieves, Serv Obstet & Ginecol, Granada, Spain
[3] Univ Granada, Dept Obstet Ginecol, Granada, Spain
[4] CIBER Epidemiol & Salud Publ CIBERESP, Madrid, Spain
[5] Inst Invest Biosanitaria Ibs GRANADA, Granada, Spain