Authors
M. Lyapina
Medical College “Yo. Filaretova”, Medical University – Sofia, Bulgaria
K. Lyubomirova
Department of Occupational Medicine, Faculty of Public Health, Medical University – Sofia, Bulgaria
T. Kundurzhiev
Department of Occupational Medicine, Faculty of Public Health, Medical University – Sofia, Bulgaria
M. Vizeva
Medical College “Yo. Filaretova”, Medical University – Sofia, Bulgaria
