1. Dental School, Faculty of Medicine and Health SciencesUniversity of Ghent, Department of Periodontolgy and Oral Implantology Ghent Belgium
2. All Saints Green Dental Practice Norwich UK
3. Faculty of Medicine and Health SciencesUniversity of Ghent, Department of Periodontology and Oral Implantology Belgium
4. Dental DepartmentRadboud University Medical Centre Nijmegen Gelderland The Netherlands
5. Department of Periodontology and ImplantologyRadboud University Medical Centre Nijmegen Gelderland The Netherlands