1. Hospital Ginecoobstetricia Número 4 “Luis Castelazo Ayala”, Instituto Mexicano del Seguro Social, México, Mexico;
2. Department of Pathology, Hospital Clinic, Universitat de Barcelona, IDIBAPS, Barcelona, Spain;
3. Department of Gynecology & Obstetrics, Hospital Clinic, Universitat de Barcelona, IDIBAPS, Barcelona, Spain