1. Institute of Nuclear Chemistry; Johannes Gutenberg-University; Fritz-Strassmann-Weg 2; D-55128; Mainz; Germany
2. Institute of Pharmacy; Johannes Gutenberg-University; Staudingerweg 5; D-55128; Mainz; Germany
3. Radiopharmacy, PET Center; University of Tübingen; Röntgenweg 15; D-72076; Tübingen; Germany