1. Department of Public Health, Medical University of Bialystok, 15-295 Bialystok, Poland
2. Department of Infectious Diseases and Allergology, Jan Kochanowski University, 25-317 Kielce, Poland
3. Faculty of Health Sciences, Klaipeda University, LT-92294 Klaipeda, Lithuania
4. Department of Infectious Diseases and Neuroinfections, Medical University of Bialystok, 15-540 Bialystok, Poland
5. Department of Infectious Diseases and Hepatology, Medical University of Bialystok, 15-540 Bialystok, Poland