1. Department of Pharmacy, Uppsala Biomedical Center, Uppsala University, P.O. Box 580, SE-751 23 Uppsala, Sweden
2. The Swedish Drug Delivery Center, Department of Pharmacy, Uppsala Biomedical Centre, Uppsala University, P.O. Box 580, SE-751 23 Uppsala, Sweden
3. Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, O&N II Gasthuisberg, Herestraat 49, Box 921, 3000 Leuven, Belgium