1. Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania
2. Harvard Medical School, Boston, Massachusetts
3. Division of Infectious Diseases/Clinical Trials Unit, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Department of Nuclear Medicine, Odense University Hospital, Odense, Denmark
5. Division of Radiology and Nuclear Medicine, Oslo University Hospital
6. Faculty of Medicine, University of Oslo, Oslo, Norway.