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K. Stoyanova
Department of Infectious Diseases, Parasitology and Dermatovenerеology, Faculty of Medicine, Medical University “Prof. Dr. Paraskev Stoyanov”Varna, Bulgaria
Specialized Medical Diagnostic Laboratory “Status”Varna, Bulgaria
S. Pavlov
Department of Anatomy, Histology and Embryology, Faculty of Medicine, Medical University “Prof. Dr. Paraskev Stoyanov”Varna, Bulgaria
T. Cvetkova
Department of Infectious Diseases, Parasitology and Dermatovenerеology, Faculty of Medicine, Medical University “Prof. Dr. Paraskev Stoyanov”Varna, Bulgaria
T. Paunov
Department of Hygiene and Epidemiology, Faculty of Public Health, Medical University “Prof. Dr. Paraskev Stoyanov”Varna, Bulgaria