1. Department of Dentistry - Quality and Safety of Oral Healthcare; Radboud University Medical Center; Radboud University; Nijmegen The Netherlands
2. Department of Epidemiology; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
3. Department of Periodontology and Operative Dentistry; Faculty of Dentistry; University of Münster; Münster Germany
4. Section for Translational Health Economics; Medical Faculty; Heidelberg University; Heidelberg Germany
5. Department of Social Dentistry; Academic Center for Dentistry Amsterdam; University of Amsterdam and VU University; Amsterdam The Netherlands