1 Queen Elizabeth The Queen Mother Hospital, Margate, United Kingdom

1 Showa University Northern Yokohama Hospital, Yokohama, Japan

2 Clinical Effectiveness Research Group, Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway

1 ARNAS Civico, Palermo, Italy

2 Humanitas University, Rozzano (MI), Italy

3 Arcispedale Santa Maria Nuova - Reggio Emilia, Reggio Emilia, Italy

4 University of Bologna, Bologna, Italy

5 European Institute of Oncology Division of Endoscopy, Milan, Italy

6 Fondazione Policlinico Universitario Agostino Gemelli, Rome, Italy

7 ASST NIGUARDA, Milano, Italy

8 Ramazzini Hospital Carpi, Azienda AUSL Modena, Carpi, Italy

9 St. Anthony Hospital Gastroenterology Unit Dept. of Medicine, Padova, Italy

10 Azienda Ospedaliera di Padova, Padua, Italy

11 Campus Biomedico, Roma, Italy

12 IRCCS San Raffaele Hospital, Milano, Italy

13 Humanitas Clinical and Research Hospital, IRCCS, Rozzano (MI), Italy

14 Humanitas University, Pieve Emanuele (MI), Italy

1 East Kent Hospitals University NHS Foundation Trust, Margate, United Kingdom

1 Chonnam National Univeristy Medical School, Gwangju, Korea, Republic of

2 Mokpo Hankook Hospital, Mokpo, Korea, Republic of

1 Kyoto Second Red Cross Hospital, Kyoto, Japan

1 Gastroenterology Unit, Department of Systems Medicine, University of Rome Tor Vergata, Rome, Italy, Roma, Italy

2 Gastrointestinal Endoscopy Research Unit, Navarrabiomed, Hospital Universitario de Navarra (HUN), Universidad Pública de Navarra (UPNA), Pamplona, Spain, Navarra, Spain

3 IdiSNA, Instituto de Investigación. Universidad de Navarra, Pamplona, Spain, Pamplon

4 Department of Gastroenterology and Endoscopy, Dupuytren University Hospital, Limoges, France, Limoges, France

5 Department of Gastroenterology and Hepatology, Nancy Regional University Hospital Center, Nancy, France, Nancy, France

6 Department of Gastroenterology and Endoscopy, Pontchaillou University Hospital, Rennes, France, Rennes, France

7 Department of Gastroenterology and Endoscopy, Hôpital Privé Jean Mermoz, Lyon, France, Lyon, France

8 Department of Gastroenterology and Endoscopy, Dijon University Hospital, Dijon, France, Dijon, France

9 Department of Gastroenterology and Endoscopy, Hospital Saint Joseph, Paris, France, Paris, France

10 Department of Gastroenterology, CHC Groupe Santé, Liège, Belgium, Liège, Belgium

11 Department of Gastroenterology and Endoscopy, Bordeaux University Hospital, Department of Gastroenterology and Endoscopy, Bordeaux University Hospital, Bordeaux, France, Bordeaux, France

12 Department of Gastroenterology and Endoscopy, Clinique de l’Anjou, Angers, France, Angers, France

13 Department of Gastroenterology and Endoscopy, Cliniques Jules Verne, Nantes, France, Nantes, France

14 Department of Gastroenterology and Endoscopy, Cochin University Hospital, Paris, France, Paris, France

15 IdiSNA, Instituto de Investigación. Universidad de Navarra, Pamplona, Spain, Pamplona, Spain

16 Gastroenterology Department, Hospital Universitario de Navarra (HUN), Navarrabiomed, Universidad Pública de Navarra (UPMNA), Pamplona, Spain, Pamplona, Spain

17 Department of Gastroenterology and Endoscopy, Georges Pompidou European Hospital, Paris, France, Paris, France

18 Department of Gastroenterology and Endoscopy, Hôpital Edouard Herriot, Hospices Civils de Lyon, Lyon, France, Lyon, France

19 Department of Gastroenterology and Endoscopy, Nice University Hospital, Nice, France., Nice, France

20 Department of Gastroenterology and Endoscopy, Humanitas Research Hospital, Milan, Italy, Milan, Italy