1. Department of Gastroenterology, University Medical Centre Maribor, Maribor, Slovenia.
2. Department of Gastroenterology, Division of Internal Medicine, University Medical Centre Ljubljana, Ljubljana, Slovenia.
3. Center for Human Molecular Genetics and Pharmacogenomics, Faculty of Medicine, University of Maribor, Maribor, Slovenia.
4. Laboratory for Biochemistry, Molecular Biology and Genomics, Faculty for Chemistry and Chemical Engineering, University of Maribor, Maribor, Slovenia.