1. Clinic of Internal Medicine-Gastroenterology
2. Clinic of Pneumology and Phthisiology
3. Clinic of Infectology and Travel Medicine, University Hospital in Martin
4. Biomedical Centre BioMed, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovakia
5. Fifth Department of Internal Medicine, Faculty of Medicine, Comenius University in Bratislava, Slovakia
6. Gastroenterology Center Bezrucova, Bratislava
7. Second Department of Internal Medicine, Medical School of PJ Safarik University and L. Pasteur University Hospital in Kosice
8. Department of Nursing, Jessenius Faculty of Medicine in Martin (JFM CU), Comenius University in Bratislava, Slovakia