Authors
Z. Pashova-Tasseva
Department of Periodontology, Faculty of Dental Medicine, Medical University – Sofia, Bulgaria
Ch. Popova
Department of Periodontology, Faculty of Dental Medicine, Medical University – Sofia, Bulgaria
E. Tosheva
Department of Statistics and Econometrics, Faculty of Applied Informatics and Statistics, University of National and World Economy – Sofia, Bulgaria
A. Mlachkova
Department of Periodontology, Faculty of Dental Medicine, Medical University – Sofia, Bulgaria
