1. Department of Clinical Dentistry - Center of Clinical Dental Research, Faculty of Medicine and Dentistry, University of Bergen, N-5009, Bergen, Norway, Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology 100 44, Stockholm, Sweden
2. Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology 100 44, Stockholm, Sweden
3. Centre for Oral Biology, Department of Odontology Karolinska Institutet, 141 04, Huddinge, Sweden
4. Department of Clinical Dentistry - Center of Clinical Dental Research, Faculty of Medicine and Dentistry, University of Bergen, N-5009, Bergen, Norway
5. Department of Clinical Dentistry - Center of Clinical Dental Research, Faculty of Medicine and Dentistry, University of Bergen, N-5009, Bergen, Norway,