1. Drug Research Program, Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
2. Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
3. HUS Medical imaging Center, Clinical Physiology and Nuclear Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
4. Centre for Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
5. School of Pharmacy, University of Eastern Finland, Kuopio, Finland
6. Department of Chemistry—Radiochemistry, University of Helsinki, Helsinki, Finland
7. Laboratory of Biohybrid Technologies, Institute of Chemistry, St. Petersburg State University, Peterhoff, Russian Federation