1. School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
2. Department of Chemistry, ‘‘Sapienza’’ University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
3. Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
4. Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
5. Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway