Authors
Ivan D. Ivanov
Department of Obstetrics and Gynaecology, Trakia Hospital – Stara Zagora, Bulgaria
Stefan A. Buzalov
Department of Obstetrics and Gynaecology, Trakia Hospital – Stara Zagora, Bulgaria
Nadezhda H. Hinkova
Department of Midwifery, Medical University – Pleven, Bulgaria