1. Endoscopy Unit, Gastroenterology Department, Complejo Hospitalario de Navarra, Pamplona, Spain
2. Navarrabiomed Biomedical Research Center, Public University of Navarre, Navarre Institute for Health Research, Pamplona, Spain
3. Gastroenterology Endoscopy Unit, Hospital Quirónsalud Málaga, Málaga, Spain
4. Digestive System and Endoscopy Unit, Hospital Quirónsalud Málaga, Málaga, Spain
5. Gastroenterology Department, Mateu Orfila General Hospital, Mahon, Spain
6. Health and Science, Birmingham City University, Birmingham, United Kingdom
7. University of Birmingham, Russells Hall Hospital, Birmingham, United Kingdom