Authors
Vanya M. Nedkova-Milanova
Division of General Medicine, Medical University – Pleven, Bulgaria
Tsvetelina V. Miteva
Division of General Medicine, Medical University – Pleven, Bulgaria
Darina N. Hristova
Department of Hygiene, Medical University - Varna, Bulgaria
Lyubomira D. Gadjelova
Division of General Medicine, Medical University – Pleven, Bulgaria
Magdalena I. Balashkova
Division of General Medicine, Medical University – Pleven, Bulgaria