1. Department of Pharmacology, Institute of Clinical Medicine; Oslo University Hospital, University of Oslo; P.O. Box 1057 Blindern 0316 Oslo Norway
2. Department of Pharmaceutical Biosciences, School of Pharmacy; University of Oslo; P.O. Box 1068 Blindern 0316 Oslo Norway
3. Department of Oral Biology; University of Oslo; P.O. Box 1052 Blindern 0316 Oslo Norway
4. Department of Paediatric Dentistry and Behavioural Science, Faculty of Dentistry; University of Oslo; P.O. Box 1052 Blindern 0316 Oslo Norway