1. Clinic Institute of Gynecology, Obstetrics and Neonatology, Faculty of Medicine, University of Barcelona, Hospital Clinic-Institut d´Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain;
2. Faculty of General Medicine, Department of Obstetrics and Gynecology, Saratov State Medical University n.a. V.I. Razumovsky, Saratov, Russia