1 Gastroenterology Department, Clínica Universidad de Navarra, Instituto de Investigación Sanitaria de Navarra (IDISNA), Clínica Universidad de Navarra. Pio XII 36, 31004, Pamplona, Spain. Electronic address: ccarretero@unav.es.
2 Gastroenterology Department, Clínica Universidad de Navarra, Clínica Universidad de Navarra. Pio XII 36, 31004, Pamplona, Spain. Electronic address: abojorquez@unav.es.
3 Department of Gastroenterology, Sheba Medical Center, Sackler School of Medicine, Tel Aviv University, Tek-Aviv, Israel. Electronic address: ramieliakim@yahoo.com.
4 Royal Free Unit for Endoscopy, The Royal Free Hospital and University College London (UCL) Institute for Liver and Digestive Health, London, United Kingdom; Saint Luke's Hospital, Small Bowel Service, Agias Sofias 18, 54622, Thessaloniki, Greece. Electronic address: nikos.lazaridis@gmail.com.