1 Centre of Gastroenterology, Medical Division, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.
2 Department of Clinical Physiology and Nuclear Medicine, Center of Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.
3 Department of Cardiology, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.
4 Institute of Clinical Medicine, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.