1. Digestive Disease Center K, Bispebjerg Hospital, University of Copenhagen, Bispebjerg Hospital, Copenhagen, Denmark;
2. Department of Gastroenterology and Gastrointestinal Surgery, University of Copenhagen, Hvidovre Hospital, Copenhagen, Denmark;
3. National Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark;
4. Department of Clinical Physiology Nuclear Medicine and PET, University of Copenhagen, Rigshospitalet, Copenhagen, Denmark;
5. Department of Clinical Physiology and Nuclear Medicine, University of Copenhagen, Glostrup Hospital, Glostrup, Denmark;
6. Department of Research and Development, Zealand Pharma, Glostrup, Denmark