Authors
G. Yankov
Department of Respiratory Diseases, Medical Faculty, Medical University – Sofia, Bulgaria
V. Ilieva
Department of Anesthesiology and Intensive Care, Medical Faculty, Medical University – Sofia, Bulgaria
B. Vladimirov
Department of Gastroenterology, Medical Faculty, Medical University – Sofia, Bulgaria
M. Kovacheva
Department of Gastroenterology, Medical Faculty, Medical University – Sofia, Bulgaria
E. Mekov
Department of Respiratory Diseases, Medical Faculty, Medical University – Sofia, Bulgaria
R. Petkov
Department of Respiratory Diseases, Medical Faculty, Medical University – Sofia, Bulgaria
