1. Obstetrics and Gynecology Service, La Inmaculada Hospital, Huércal-Overa, Almería, Spain
2. Department of Obstetrics and Gynecology, University of Granada, Granada, Spain
3. Obstetrics and Gynecology Service, Virgen de las Nieves University Hospital, Granada, Spain
4. Consortium for Biomedical Research in Epidemiology and Public Health (CIBER Epidemiología y Salud Pública-CIBERESP), Madrid, Spain
5. Biohealth Research Institute (Instituto de Investigación Biosanitaria Ibs.GRANADA), Granada, Spain