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N. Stamenov
Department of Periodontology and Oral Diseases, Faculty of Dental Medicine, Medical University – Plovdiv, Bulgaria, DM 109 Hristo Botev blvd. Bg − 4000 Plovdiv tel.: 0888442026
G. Tomov
Department of Periodontology and Oral Diseases, Faculty of Dental Medicine, Medical University − Plovdiv, Bulgaria
Z. Denkova
Deparment of Microbiology, University of Food technologies – Plovdiv, Bulgaria
I. Dobrev
Deparment of Microbiology, University of Food technologies – Plovdiv, Bulgaria