1. Facultad de Ciencias Médicas, Institute of Biomedicine, Research Area for Women’s Health, Universidad Católica de Santiago de Guayaquil, Enrique C. Sotomayor Obstetrics and Gynecology Hospital, Guayaquil, Ecuador,
2. Department of Obstetrics and Gynecology, Facultad de Medicina, Universidad de Zaragoza, Lozano Blesa University Hospital, Zaragoza, Spain, and
3. Department of Clinical and Experimental Medicine, Division of Obstetrics and Gynecology, University of Pisa, Pisa, Italy