Ditte Drejer1, Christian B Laursen2, Ole Graumann3. 1. Urology Department, Fredericia Hospital, Fredericia, Denmark. 2. Department of Respiratory Medicine, Odense University Hospital, Odense, Denmark. 3. Research Unit at the Department of Radiology, Odense University Hospital, Odense, Denmark Institute of Clinical Research, University of Southern Denmark, Odense, Denmark.