1. Faculty of Odontology, Department of Oral Biology, Malmö University, Malmö, Sweden
2. Faculty of Odontology, Department of Periodontology, Malmö University, Malmö, Sweden
3. Faculty of Odontology, Department of Prosthodontics, Malmö University, Malmö, Sweden
4. Faculty of Odontology, Department of Dental Materials Science, Malmö University, Malmö, Sweden