1. Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto, Portugal
2. Instituto de Telecomunicações, Faculty of Sciences of the University of Porto, Porto, Portugal
3. Department of Medicine, Surgery and Translational Medicine, University Hospital Sant'Andrea, University Sapienza Roma, Rome, Italy
4. Los Angeles County Hospital, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
5. University of Medicine and Pharmacy TG., Mures, Romania
6. NIHR Biomedical Research Unit in Gastrointestinal and Liver Diseases at Nottingham University Hospitals NHS Trust and the University of Nottingham, Nottingham, United Kingdom