1. Department of Periodontology and Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium
2. Department of Prosthodontics; School of Dentistry; Faculty of Odontology; Malmö University; Malmö Sweden
3. Department of Restorative Dentistry and Endodontology; Section of Fixed Prosthodontics; Dental School; Faculty of Medicine and Health Sciences; Ghent University; Ghent Belgium