Authors
B. Vasileva
Faculty of Public Health Medical University, Sofia, Bulgaria
Al. Vodenicharova
a.vodenicharova@foz.mu-sofia.bg
Faculty of Public Health Medical University, Sofia, Bulgaria
a.vodenicharova@foz.mu-sofia.bg
© 2020 B. Vasileva, Al. Vodenicharova, published by Medical University - Sofia
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.