1. Department of Obstetrics and Gynecology and Reproductive Biology, Faculty of Medicine, Universidad de los Andes, Santiago, Chile;
2. Department of Pathology, Hospital Clinic, Barcelona, Spain;
3. Clinic Institute of Gynecology, Obstetrics and Neonatology, Hospital Clinic-Institut d’Investigacions Biomèdiques August Pi i Sunyer, University of Barcelona, Barcelona, Spain