Authors
Dima K. Tsanova
Department of Public Health Sciences, Medical University – Pleven, Bulgaria
Toni Y. Vekov
Department of Pharmaceutical Sciences and Social Pharmacy, Medical University – Pleven, Bulgaria
© 2019 Dima K. Tsanova, Toni Y. Vekov, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.