1. Center of Functional Imaging and Research, Department of Clinical Physiology and Nuclear Medicine, Hvidovre University Hospital, Copenhagen, Denmark
2. Gastro Unit, Medical Division, Hvidovre University Hospital, Copenhagen, Denmark
3. Geriatric Research Unit, Department of Geriatrics and Palliative Medicine, Bispebjerg and Frederiksberg University Hospitals, Copenhagen, Denmark
4. Geriatric Research Unit, Department of Medicine, Herlev and Gentofte University Hospitals, Copenhagen, Denmark
5. Department of Clinical Physiology, Nuclear Medicine and PET, Rigshospitalet-Glostrup, University of Copenhagen, Copenhagen, Denmark