Authors
Kremena K. Atanasova
Department of Otorhinolaryngology, Medical University, Pleven, Bulgaria
Georgi N. Nikolov
Department of Otorhinolaryngology, Medical University, Pleven, Bulgaria
Joana I. Simeonova
Department of Pharmaceutical Sciences and Social Pharmacy, Medical University, Pleven, Bulgaria
Boris I. Duhlenski
Department of Otorhinolaryngology, Medical University, Pleven, Bulgaria