1 Division of Gastroenterology, Feinberg School of Medicine, Northwestern University, Chicago, IL, US.
2 Department of Surgery, Oncology and Gastroenterology, University of Padua, Padua, Italy.
3 4th Local Primary Health Care Unit, Academic Unit of Heraklion, Clinic of Social and Family Medicine, University of Crete, Greece.
4 Department of Gastroenterology, Amsterdam University Medical Center, Amsterdam, the Netherlands.
5 National Institute for Health Research Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust, UK; School of Medicine, University of Nottingham and Nottingham Digestive Diseases Centre, University of Nottingham, Nottingham, UK.
6 School of Cancer and Pharmaceutical Sciences, King's College London, UK; Professor and Consultant of Surgery, Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
7 La Mina Primary Care Academic Health Centre, University of Barcelona, Catalan Institute of Health, Barcelona, Spain.
8 Manchester University NHS Foundation Trust, Manchester, UK.
9 Université Claude Bernard Lyon 1 and Hospices Civils de Lyon, Digestive Physiology, Hopital E Herriot, Lyon, France.
10 CHU de Bordeaux, Centre Medico-chirurgical Magellan, Hôpital Haut-Lévêque, Université de Bordeaux, INSERM CIC 1401, Bordeaux, France.
11 Primary Care and General Practice, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.