Authors
E. Mekov
Department of Occupational Diseases, Medical University – Sofia, Bulgaria
N. Yanev
Department of Respiratory Diseases, Medical University – Sofia, Bulgaria
N. Kurtelova
Department of Respiratory Diseases, Medical University – Sofia, Bulgaria
T. Mihalova
Department of Respiratory Diseases, Medical University – Sofia, Bulgaria
Y. Yamakova
Department of Anesthesiology and Intensive Care, Medical University – Sofia, Bulgaria
R. Petkov
Department of Respiratory Diseases, Medical University – Sofia, Bulgaria
