[1] Univ Calif San Francisco, Med Ctr, Dept Radiol, San Francisco, CA 94143 USA
[2] Tech Univ Munich, Dept Radiol, D-8000 Munich, Germany
[3] Tech Univ Munich, Inst Pathol, Div Neuropathol, D-8000 Munich, Germany
[4] Tech Univ Munich, Dept Nucl Med, D-8000 Munich, Germany
[5] Goethe Univ Frankfurt, D-6000 Frankfurt, Germany