Authors
Ts. Stoitsev
Medical Faculty, Medical University – Plovdiv, Bulgaria
D. Markov
General and Clinical Pathology, Medical University – Plovdiv, Bulgaria
V. Aleksiev
Cardiovascular Surgery, Medical University – Plovdiv, Bulgaria
S. Markov
Department of Otorhinolaryngology, Medical University - Plovdiv, Bulgaria
Department of Otorhinolaryngology, University Hospital “St. George”, Plovdiv, Bulgaria