1. Institute of Pathology; Medical University of Graz; Graz Austria
2. Institute of Pathology; Technical University of Dresden; Dresden Germany
3. Department of Pathology; Ankara University Medical School; Ankara Turkey
4. Institute of Pathology; Spedali Civili; Brescia Italy
5. Institute of Pathology; Carol Davila University of Medicine and Pharmacy; Bucharest Romania
6. Centre for Digestive Diseases; Internal Medicine Eppendorf; Hamburg Germany
7. Department of Pathology; UZ Ghent; Ghent Belgium
8. Division of Gastroenterology and Hepatology; Department of Clinical and Experimental Medicine; Faculty of Health Science; Linköpings University; Linköping Sweden