1. Department
of Nuclear Medicine, University Hospital Zürich, Rämistrasse
100, 8091 Zürich, Switzerland
2. Center for Radiopharmaceutical
Sciences of ETH, PSI and USZ, Vladimir-Prelog-Weg
4, 8093 Zürich, Switzerland
3. Department
of Chemistry and Biochemistry, University of Bern, Freiestrasse
3, 3012 Bern, Switzerland
4. Department
of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, United Kingdom