1. Department of Periodontology and Biomaterials, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.
2. Technical Medicine, University of Twente, Enschede, The Netherlands.
3. Department of Oral and Maxillofacial Surgery, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.
4. Department of Preventive and Curative Dentistry, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.