1. Department of Gastroenterology, Portuguese Oncology Institute of Porto, Porto, Portugal
2. Department of Physiology, Cardiovascular Research and Development Unit, Porto Faculty of Medicine, Porto University, Porto, Portugal
3. Department of Gastroenterology, Centro Hospitalar do Porto, Porto, Portugal
4. CINTESIS/Biostatistics and Medical Informatics, Faculty of Medicine, Porto University, Porto, Portugal
5. Department of Gastroenterology, Hospital de Braga, Braga, Portugal
6. Department of Gastroenterology, Hospital de São João, Porto, Portugal
7. Department of Gastroenterology, Portuguese Oncology Institute of Coimbra, Coimbra, Portugal
8. Department of Pathology, Portuguese Oncology Institute of Porto, Porto, Portugal
9. Department of Gastroenterology, Academic Medical Center, Amsterdam, The Netherland
10. Division of Gastroenterology and Hepatology, Veterans Affairs Medical Center, Kansas City, Missouri, USA
11. Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan