1. Faculty of Medicine; Pavel Jozef Safarik University; Kosice Slovak Republic
2. Clinica Medica I; Fondazione IRCCS Policlinico San Matteo; Università degli Studi di Pavia; Pavia Italy
3. Department of Gastroenterology; Central University Hospital of Asturias (HUCA); Oviedo Asturias Spain
4. International Clinical Research Center; St. Anne's University Hospital and Masaryk University; Brno Czech Republic
5. Department of Microbiology and Immunology; University of Veterinary Medicine and Pharmacy; Kosice Slovak Republic