1. Department of Paediatrics, Gastroenterology, Hepatology, Nutrition, Allergology and Pulmonology, Medical University of Białystok, Białystok, Poland
2. Department of Pediatric Infectious Diseases, Medical University of Białystok, Białystok, Poland
3. Department of Microbiological Diagnostics and Infectious Immunology, Medical University of Białystok, Białystok, Poland
4. Department of Medical Pathomorphology, Medical University of Białystok, Białystok, Poland