1. Department of Infectious Diseases, Jan Kochanowski University, 25-640, Kielce, Poland
2. Department of Infectious Diseases and Hepatology, Medical University of Białystok, 15-540, Białystok, Poland
3. Department of Pediatrics, Gastroenterology, Hepatology, Nutrition and Allergology, Medical University of Bialystok, 15-247, Bialystok, Poland