1. Department of Chemistry; University of Turku; 20014 Turku Finland
2. Turku PET Centre (Å)bo Akademi University; 20520 Turku Finland
3. Department of Cellular and Molecular Medicine; School of Medicine; University of California; 92093 San Diego, La Jolla CA USA
4. Department of Cell biology and Anatomy; Institute of Biomedicine; University of Turku; 20520 Turku Finland
5. Turku PET Centre; University of Turku; 20520 Finland