1. UCL Institute for Liver & Digestive Health; Division of Medicine, Royal Free Campus, University College London; London UK
2. UCL Institute for Liver & Digestive Health, Division of Medicine, Royal Free Campus, University College London; London UK
3. Gastrounit; Medical Division, Copenhagen University Hospital Hvidovre; Hvidovre Denmark
4. Gastrounit, Medical Division; Copenhagen University Hospital Hvidovre; Hvidovre Denmark