1. Obstetrics and Gynecology Unit, Arpa Medica Clinic, Ramón y Cajal University Hospital and University of Alcalá, Madrid, Spain.
2. Department of Obstetrics and Gynecology, San Francisco de Asís University Hospital, La Paz University Hospital, and Alfonso X El Sabio University, Madrid, Spain.
3. Obstetrics and Gynecology Unit, HM Polyclinic Cabinet Velázquez, Madrid, Spain.
4. Department of Obstetrics and Gynecology, Virgen de la Arrixaca University Clinical Hospital, University of Murcia, Murcia, Spain.
5. Medical Department, ITF Research Pharma, S.L.U., Madrid, Spain.