1. Department of Chemical and Biological Engineering; Chalmers University of Technology; Göteborg Sweden
2. Department of Prosthodontics, Faculty ofOdontology; Malmö University; Malmö Sweden
3. Department of Oral and Maxillofacial Surgery and Oral Medicine, Faculty of Odontology; Malmö University; Malmö Sweden
4. Department of Oral Biology, Faculty of Odontology; Malmö University; Malmö Sweden