Stefan Listl1,2, Robert Weyant3. 1. Radboud University Medical Center, Radboud Institute for Health Sciences, Department of Dentistry - Quality and Safety of Oral Healthcare, Nijmegen, The Netherlands. 2. Translational Health Economics, Medical Faculty, Heidelberg University, Heidelberg, Germany. 3. Department of Dental Public Health, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.