1. Clinic for Removable Prosthodontics Faculty of Medicine and Health Sciences Dental School Ghent University Ghent Belgium
2. Department of Economics Faculty of Economics and Business Administration Ghent University Ghent Belgium
3. Besseler Dental Clinic Enschede The Netherlands
4. Department of Periodontology and Oral Implantology Faculty of Medicine and Health Sciences Dental School Ghent University Ghent Belgium
5. Department of Dentistry‐ Implantology & Periodontology University Medical Center, Research Institute Health Sciences Nijmegen The Netherlands