1. Department of Periodontology and Oral Implantology; Faculty of Medicine and Health Sciences; Dental School; University of Ghent; Ghent Belgium
2. Oral and Maxillofacial Imaging Unit; Faculty of Medicine and Health Sciences; Dental School; University Hospital Ghent; Ghent Belgium
3. Department of Prosthetic Dentistry; Malmö University; Malmö Sweden
4. Clinic for Prosthodontics; Centre of Dental Specialist Care; Malmö Sweden
5. Dental Medicine; Faculty of Medicine and Pharmacy; Free University of Brussels (VUB); Brussels Belgium