1. Dental Biomaterials Adverse Reaction Unit NORCE Norwegian Research Centre AS Bergen Norway
2. Department of Clinical Dentistry University of Bergen Bergen Norway
3. Department of Community Medicine Faculty of Health Sciences The National Research Center in Complementary and Alternative Medicine (NAFKAM) UiT The Arctic University of Norway Tromsø Norway
4. Research Unit for General Practice Uni Research Health Bergen Bergen Norway
5. Department of General Practice Institute of Health and Society University of Oslo Oslo Norway
6. Mozartring 13 Dorfen Germany
7. Institute for Applied Epistemology and Medical Methodology University of Witten/Herdecke Freiburg Germany