Authors
Ljubomir S. Kovachev
Department of Propaedeutics of Surgical Diseases, Medical University – Pleven, Bulgaria
Pencho T. Tonchev
Department of Propedeutics of Surgical Diseases, Medical University – Pleven, Bulgaria
Kiril L. Nedialkov
Department of Propedeutics of Surgical Diseases, Medical University – Pleven, Bulgaria