¹Karolinska Institutet, NVS, Division of Nursing, Huddinge, Sweden, ²Karolinska Institutet, Department of Medicine, Stockholm, Sweden, ³Karolinska University Hospital, Gastroenterology Unit, Stockholm, Sweden

¹University of Padova, Department of Medicine, Padova, Italy, ²University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ³Azienda Ospedaliera di Padova, UOC Gastroenterologia, Padova, Italy, ⁴Azienda Ospedaliera di Padova, UOSD Progetti e Ricerca Clinica, Padova, Italy

¹Hospital San Juan de Dios del Aljarafe, Internal Medicine, Seville, Spain, ²University of Seville, Nursing Department, Seville, Spain, ³University of Seville, Physiotherapy Department, Seville, Spain, ⁴San Juan de Dios del Aljarafe Hospital, Surgery Service, Seville, Spain

Faculdade de Medicina da USP, Gastroenterology, São Paulo, Brazil

¹Federal University of Rio de Janeiro, Internal Medicine, Rio de Janeiro, Brazil, ²Nestle Research Center, Digestive Health - Nutrition and Health Research, Lausanne, Switzerland

¹Linköping University, Department of Primary Health Care in Kalmar County Council of Kalmar, Sweden, Blomstermåla, Sweden, ²Linköping University, Research and Development Unit and Department of Medical and Health Sciences, Linköping, Sweden, ³Linköping University, Department of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping, Sweden, ⁴Linköping University, Centre for Organisational Support and Development, Region Östergötland, Linköping, Sweden, ⁵County council of Jönköping, Department of Medicine, County Hospital Ryhov, Jönköping, Sweden, ⁶University of Pennsylvania, US., Prof School of Nursing, Philadelphia, USA, ⁷Linköping university, Anaesthetics, Operations and Speciality Surgery Centre and Department of Medical and Health Sciences, Linköping, Sweden

Azienda Ospedaliera di Padova, Surgery Oncology and Gastroenterology, Padua, Italy

Fondazione Policlinico Gemelli, Centro Malattie Apparato Digerente, Roma, Italy

¹University of Padova, Department of Medicine, Padova, Italy, ²University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ³Azienda Ospedaliera di Padova, UOC Gastroenterologia, Padova, Italy, ⁴Azienda Ospedaliera di Padova, UOSD Progetti e Ricerca Clinica, Padova, Italy

¹Henry Dunant Hospital Center, Athens, Greece, ²‘Evangelismos-Ophthalmiatreion Athinon-Polykliniki’ Hospital of Athens, Athens, Greece, ³‘Tzaneio’ General Hospital of Piraeus, Piraeus, Greece, ⁴National and Kapodistrian University of Athens, Athens, Greece

¹University of Padova, Department of Medicine, Padova, Italy, ²University of Padova, Department of Cardiac, Thoracic and Vascular Sciences, Padova, Italy, ³University of Padova, Department of Surgical, Oncological and Gastroenterological Sciences, Padova, Italy, ⁴Azienda Ospedaliera di Padova, UOC Gastroenterologia, Padova, Italy, ⁵Azienda Ospedaliera di Padova, UOSD Progetti e Ricerca Clinica, Padova, Italy

¹São Paulo State University (Unesp), Medical School, Botucatu, Internal Medicine, Botucatu, São Paulo, Brazil, ²São Paulo State University (Unesp), Medical School, Botucatu, Nursing, Botucatu, Sao Paulo, Brazil, ³São Paulo State University (Unesp), Medical School, Botucatu, Surgery, Botucatu, São Paulo, Brazil

¹Linköping university, Department of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping, Sweden, ²Linköping university, Unit for Health Analysis and Department of Medical and Health Sciences, Linköping, Sweden, ³Linköping University, Department of Anaesthesiology and Intensive Care, and Department of Medical and Health Sciences, Linköping, Sweden, ⁴Linköping University, Department of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping, Sweden

¹Tampere University Hospital, Hatanpää, Tampere, Finland, ²Tamperee University Hospital, Gastroenterology, Tampere, Finland, ³University of Helsinki and Helsinki University Hospital, Helsinki, Finland

¹Kinshukai Infusion Clinic, Osaka, Japan, ²Osaka University Graduate School of Medicine, Department of Gastroenterology and Hepatology, 2-2 Yamadaoka, Suita, Japan

NHS Highland, Gastroenterology, Inverness, UK

Meyer Children’s Hospital, Pediatric Gastrenterology and Nitrition Unit - Day Hospital, Florence, Italy

¹Henry Dunant Hospital Center, Athens, Greece, ²‘Evangelismos-Ophthalmiatreion Athinon-Polykliniki’ Hospital of Athens, Athens, Greece, ³‘Tzaneio’ General Hospital of Piraeus, Piraeus, Greece, ⁴University College London, London, UK, ⁵National and Kapodistrian University of Athens, Athens, Greece

The Children's Memorial Health Institute, Department of Gastroenterology, Hepatology, Feeding disorders and Pediatrics, Warsaw, Poland

Klinikum der Universität München, Medizinische Klinik und Poliklinik II, Munich, Germany