1. Department of Obstetrics and Gynecology, University of Zaragoza Faculty of Medicine, Clínico de Zaragoza Hospital, Zaragoza, Spain
2. Immunology Service, University of Zaragoza Faculty of Medicine, Clínico de Zaragoza Hospital, Zaragoza, Spain
3. Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA,
4. Institute of Biomedicine, Facultad de Ciencias Médicas, Universidad Católica de Santiago de Guayaquil, Ecuador
5. Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, CT, USA