1. Turku PET Centre (P.I., R.L., R.B., H.-R.L., M.B., A.V., V.L., R.M., J.K., P.N.), University of Turku, 20521 Turku, Finland
2. Institute of Clinical Physiology (P.I., M.B.), National Research Council, 56124 Pisa, Italy
3. Clinical Physiology (J.P.), University of Turku, 20521 Turku, Finland
4. Departments of Radiology (R.B., R.P.), University of Turku, 20521 Turku, Finland
5. Medicine (P.N.), University of Turku, 20521 Turku, Finland