Authors
S. Dermendzhiev
Division of Occupational Diseases and Toxicology, 2nd Department of Internal Medicine, Faculty of Medicine, Medical University – Plovdiv, Bulgaria
A. Dzhambov
Department of Hygiene and Ecomedicine, Faculty of Public Health, Medical University – Plovdiv, Bulgaria
T. Dermendzhiev
Department of Microbiology and Immunology, Faculty of Pharmacy, Medical University – Plovdiv, Bulgaria
