Authors
N. Stoyanova
Department of Obstetrics and Gynecology, Faculty of Medicine, Medical University, Pleven, Bulgaria
N. Popovski
Department of Obstetrics and Gynecology, Faculty of Medicine, Medical University, Pleven, Bulgaria
Y. Popov
Department of Obstetrics and Gynecology, Faculty of Medicine, Medical University, Pleven, Bulgaria
T. Totev
Department of Obstetrics and Gynecology, Faculty of Medicine, Medical University, Pleven, Bulgaria
