Tihomir Pankov Totev1,2, Georgi Danielov Prandzhev1,2, Slavcho Tomov Tomov1,2, Nadezhda Hristova Hinkova1,2, Grigor Angelov Gortchev1,2
1Department of Obstetrics and Gynecology, Medical University - Pleven, Pleven, Bulgaria
2Department of Obstetrics and Gynecology, University Hospital Saint Marina - Pleven, Pleven, Bulgaria