1. Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Kassai Street 26, 4012 Debrecen, Hungary
2. Department of Clinical Immunology, Faculty of Medicine, Institute of Internal Medicine, Doctoral School of Clinical Immunology and Allergology, University of Debrecen, Moricz Zs. Street 22, 4032 Debrecen, Hungary
3. GI Unit, Department of Infectology, Faculty of Medicine, Doctoral School of Clinical Immunology and Allergology, University of Debrecen, Bartok Bela Street 2-26, 4031 Debrecen, Hungary