1. Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway;
2. Nordic Institute of Dental Materials (NIOM AS), Oslo, Norway;
3. Department of Cariology, Institute of Clinical Dentistry, University of Oslo, Oslo, Norway;
4. Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway;
5. Department of Maxillofacial Surgery, Oslo University Hospital, Oslo, Norway