1. Department of Neurology and Brain Tumor Center, University Hospital Zurich and University of Zurich, CH-8091 Zurich, Switzerland.
2. Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH Zürich), Vladimir-Prelog-Weg 4, CH-8093 Zürich, Switzerland.
3. Philochem AG, CH-8112 Otelfingen, Switzerland.
4. Department of Neuroradiology, Clinical Neuroscience Center, University Hospital Zurich, University of Zurich, CH-8091 Zurich, Switzerland.