1. Faculty of Psychology, Universidad Nacional de Educación a Distancia, (UNED) Madrid, Spain
2. Department of Obstetrics and Gynecology, Central University Hospital of Asturias, Oviedo, Spain
3. Department of Obstetrics and Gynecology, San Carlos Clinic Hospital, Universidad Complutense, Madrid, Spain
4. Department of Psychology. The George Washington University, Washington DC, USA