Authors
G. Yankov
Department of Pulmonary Diseases, University Hospital “Sv. Sofia”, Faculty of Medicine, Medical University – Sofia, Bulgaria
M. Alexieva
Department of Pulmonary Diseases, University Hospital “Sv. Sofia”, Faculty of Medicine, Medical University – Sofia, Bulgaria
M. Kovacheva-Slavova
Department of Gastroenterology, University Hospital “Ts. Yoanna”, Faculty of Medicine, Medical University – Sofia, Bulgaria
B. Vladimirov
Department of Gastroenterology, University Hospital “Ts. Yoanna”, Faculty of Medicine, Medical University – Sofia, Bulgaria
E. Mekov
Department of Occupational Diseases, University Hospital “Sv. Ivan Rilski”, Faculty of Medicine, Medical University – Sofia, Bulgaria
