1. Department of Physics and Astronomy University of British Columbia Vancouver British Columbia V6T 2B5 Canada
2. Klinikum rechts der Isar Nuklearmedizinische Klinik und Poliklinik Technische Universität München München 81675 Germany
3. MRI Research Centre University of British Columbia Vancouver British Columbia V6T 2B5 Canada
4. Nuclear Medicine TRIUMF Vancouver British Columbia V6T 2A3 Canada
5. Pacific Parkinson's Research Centre University of British Columbia Vancouver British Columbia V6T 2B5 Canada