1. UCL Institute for Liver and Digestive Health, Royal Free Hospital and UCL; London UK
2. Department of Cellular Pathology; Royal Free Hospital; London UK
3. Department of Medical and Health Sciences; Linköping University; Linköping Sweden
4. National Institute of Gastroenterology, “S. de Bellis” Research Hospital; Castellana Grotte Italy
5. Academic Department of Medicine; Hippokration General Hospital; Athens Greece