1 Philip R Lee Institute for Health Policy Studies and the Department of Preventive and Restorative Dental Sciences, University of California San Francisco, San Francisco, CA 94143, USA. Electronic address: cristin.kearns@ucsf.edu.
2 WHO Collaborating Centre in Oral Health Inequalities and Public Health Department of Epidemiology and Public Health, University College London, London, UK.
3 Charles Perkins Centre, School of Pharmacy, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia.
4 WHO Collaborating Centre for Quality-Improvement, Evidence-Based Dentistry, Department of Epidemiology and Health Promotion, New York University College of Dentistry, New York, NY, USA.