Authors
V. Doicheva
Department of Epidemiology, Medical University – Sofia, Bulgaria
S. Angelova
Department of Epidemiology, Medical University – Sofia, Bulgaria
N. Chumak
Department of Epidemiology, Medical University – Sofia, Bulgaria
© 2020 Y. Mitova, V. Doicheva, S. Angelova, N. Chumak, published by Sofia Medical University
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.