1. Department of Periodontology and Oral Implantology; Dental School; Faculty of Medicine and Health Sciences; University of Ghent; Ghent Belgium
2. Department of Prosthodontics; University of North Carolina School of Dentistry; Chapel Hill NC USA
3. Research Department; Dentistry School; Universitat Internacional de Catalunya; Catalunya Spain
4. Oral Health Research Group (ORHE); Faculty of Medicine and Pharmacy; Vrije Universiteit Brussel; Brussels Belgium
5. Department of Prosthodontics; Faculty of Odontology; Malmö University; Malmö Sweden