1. Gastroenterology Department, Portuguese Oncology Institute of Porto, Porto, Portugal
2. Department of Medical-Surgical Sciences and Translational Medicine, Sant’Andrea Hospital, Sapienza University of Rome, Rome, Italy
3. MEDCIDS – Department of Community Medicine, Information and Decision in Health, Faculty of Medicine, University of Porto, Porto, Portugal
4. Surgery and Physiology Department, Faculty of Medicine, University of Porto, Porto, Portugal