1. Department of Nuclear Medicine, Odense University Hospital, 5000 Odense, Denmark
2. Research Unit of Clinical Physiology and Nuclear Medicine, Department of Clinical Research, University of Southern Denmark, 5230 Odense, Denmark
3. Department of Anatomy, Cell Biology, Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA
4. Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
5. Division of Radiology and Nuclear Medicine, Oslo University Hospital, 0424 Oslo, Norway
6. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, 0315 Oslo, Norway