1. Drug Research Program, Division
of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, P.O. Box 56 (Viikinkaari 5 E), FI-00014 University of Helsinki, Helsinki, Finland
2. Research Unit of Medical Imaging, Physics and Technology, University of Oulu, P.O. Box 5000 (Aapistie 5 A), FI-90220 Oulu, Finland
3. Medical Research Center, University of Oulu and Oulu University Hospital, P.O. Box 5000
(Aapistie 5 A), FI-90220 Oulu, Finland
4. Department of Chemistry, Faculty
of Science, P.O. Box 55 (A.I. Virtasen Aukio 1), FI-00014 University of Helsinki, Helsinki, Finland