1. Department of Infectious Diseases and Hepatology, Faculty of Medicine, Collegium Medicum Bydgoszcz, Nicolaus Copernicus University, 87-100 Torun, Poland
2. Department of Paediatrics, Infectious Diseases and Hepatology, Voivodeship Infectious Observation Hospital in Bydgoszcz, 85-030 Bydgoszcz, Poland
3. Collegium Medicum, Jan Kochanowski University, 25-317 Kielce, Poland
4. Department of Children’s Infectious Diseases, Medical University of Warsaw, 01-201 Warsaw, Poland
5. Department of Pediatric Infectious Diseases, Regional Hospital of Infectious Diseases in Warsaw, 01-201 Warsaw, Poland
6. Pomeranian Centre of Department of Infectious Diseases and Observation for Children, Smoluchowskiego 18, 80-214 Gdansk, Poland
7. Department of Infectious Diseases and Allergology, Jan Kochanowski University, 25-317 Kielce, Poland
8. Department of Infectious Diseases and Hepatology, Medical University of Białystok, 15-540 Bialystok, Poland