Authors
E. Mekov
Department of Occupational Diseases, Faculty of Medicine, Medical University – Sofia, Bulgaria
R. Petkov
Department of Pulmonary Diseases, Faculty of Medicine, Medical University – Sofia, Bulgaria
A. Tsakova
Central Clinical Laboratory, University Hospital Alexandrovska, Medical University – Sofia, Bulgaria
M. Genova
Central Clinical Laboratory, University Hospital Alexandrovska, Medical University – Sofia, Bulgaria
D. Kostadinov
Department of Pulmonary Diseases, Faculty of Medicine, Medical University – Sofia, Bulgaria
