1. School of Pharmacy, University of Oslo, PO Box 1068 Blindern, 0316 Oslo, Norway
2. School of Pharmaceutical Sciences, Faculty of Health & Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
3. FMC BioPolymer/NovaMatrix, Sandvika, Norway
4. School of Pharmacy, University of Oslo, PO Box 1068 Blindern, 0316 Oslo, Norway.