1. Department of Neurosurgery University Hospital Zurich, University of Zurich Switzerland
2. Clinical Neuroscience Center University Hospital Zurich, University of Zurich Switzerland
3. Department of Geography University of Hong Kong China
4. Department of Nuclear Medicine University Hospital Zurich, University of Zurich Switzerland
5. Department of Neuroradiology University Hospital Zurich, University of Zurich Switzerland
6. Department of Anesthesia and Pain Management University Health Network Toronto Ontario Canada
7. Institute of Medical Science University of Toronto Toronto Ontario Canada
8. Joint Department of Medical Imaging and the Functional Neuroimaging Laboratory University Health Network Toronto Ontario Canada