1. Department of Social Dentistry, Academic Centre for Dentistry Amsterdam, University of Amsterdam and VU University, Amsterdam, the Netherlands
2. School of Pharmacy, Keele University, Newcastle under Lyme, Staffordshire, UK
3. Department of Conservative Dentistry, Section for Translational Health Economics, Heidelberg University, Heidelberg, Germany
4. Department of Dentistry–Quality and Safety of Oral Health Care, Radboud University–Radboudumc, Nijmegen, the Netherlands