1. Department of Periodontology and Oral Implantology; Faculty of Medicine and Health Sciences; School of Dental Medicine; Ghent University; Ghent Belgium
2. Department of Removable Prosthodontics; Faculty of Medicine and Health Sciences; School of Dental Medicine; Ghent University; Ghent Belgium
3. Faculty of Medicine and Pharmacy; Dental Medicine; Free University of Brussels (VUB); Brussels Belgium