1. School of Pharmacy, Faculty of Health Sciences, University of Eastern Finland, Box 1627, FI-70211 Kuopio, Finland
2. Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FI-00014 Helsinki, Finland
3. Institute of Biomedicine, Faculty of Medicine, University of Turku, FI-20014 Turku, Finland