Affiliation: | 1.Department of Obstetrics and Gynecology, Nuevo Belén University Hospital, Madrid, Spain ;2.Department of Obstetrics and Gynecology, Hospital Nuestra Señora de Sonsoles, Ávila, Spain ;3.Department of Obstetrics and Gynecology, Marqués de Valdecilla University Hospital, Santander, Spain ;4.Department of Preventive Medicine, University of Cantabria Medical School – IDIVAL, and CIBER Epidemiologia y Salud Publica (CIBERESP), Santander, Spain ;5.Unit of Cancer Epidemiology, National Center of Epidemiology (Institute of Health Carlos III) and CIBER Epidemiologia y Salud Publica (CIBERESP), Madrid, Spain ;6.Facultad de Medicina (Medicina Preventiva), Avda. Herrera Oria s/n, 39011, Santander, Cantabria, Spain ; |