1. Obstetrics and Gynecology Department, Hospital Universitario de Torrejón, Madrid, Spain
2. School of Medicine, Universidad Francisco de Vitoria, Madrid, Spain
3. AFIPE Research Group, Faculty of Sciences for Physical Activity and Sport, INEF, Universidad Politécnica de Madrid (UPM), Madrid, Spain
4. Biostatistics and Epidemiology Platform at Fundación para la Investigación e Innovación Biosanitaria del Principado de Asturias, Oviedo, Spain