1. Department of Oral Maxillofacial Surgery Radboud University Medical Center Nijmegen the Netherlands
2. Department of Dentistry Radboud University Medical Center Nijmegen the Netherlands
3. Department of Dentistry – Quality and Safety of Oral Healthcare Radboud University Medical Center, Radboud Institute for Health Sciences Nijmegen the Netherlands
4. Section for Translational Health Economics, Department of Conservative Dentistry Heidelberg University Heidelberg Germany