1. Institute of Biochemistry, Faculty of Biosciences, Pharmacy and Psychology, Leipzig University, Brüderstrasse 34, D-04103 Leipzig, Germany
2. 7TM Pharma, Fremtidsvej 3, DK-2970 Hørsholm, Denmark
3. Laboratory for Molecular Pharmacology, Department of Neuroscience and Pharmacology, The University of Copenhagen, The Panum Institute, Blegdamsvej 3, DK-2200 Copenhagen, Denmark
4. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmacy, Bautzner Landstrasse 400, D-01328 Dresden, Germany