Authors
G. Yankov
Department of Pulmonary Diseases, SBALBB “Sv. Sofia”, Faculty of Medicine, Medical University – Sofia, Bulgaria
M. Alexieva
Department of Pulmonary Diseases, SBALBB “Sv. Sofia”, Faculty of Medicine, Medical University – Sofia, Bulgaria
S. Yankova
Department of Pediatrics, SHATCD “Prof. Ivan Mitev”, Medical University – Sofia, Bulgaria
E. Mekov
Department of Occupational Diseases, UMHAT “Sv. Ivan Rilski”, Faculty of Medicine, Medical University – Sofia, Bulgaria
