1. Department of Gastroenterology, University Medical Centre Ljubljana, Ljubljana, Slovenia;
2. Medical Faculty, University of Ljubljana, Ljubljana, Slovenia;
3. Department of Infectious Diseases, University Medical Centre Ljubljana, Ljubljana, Slovenia;
4. Department of Gastroenterology Hepatology and Nutrition, Children's Hospital University Medical Centre Ljubljana, Ljubljana, Slovenia;
5. Clinical Institute of Clinical Chemistry, Biochemistry University Medical Centre Ljubljana, Ljubljana, Slovenia