1 Department Epidemiology and Health Promotion, WHO Collaborating Center for Quality Improvement and Evidence-based Dentistry, College of Dentistry, New York University, New York, NY 10010, USA. Electronic address: habib.benzian@nyu.edu.
2 Departamento de Salud Colectiva, Facultad de Odontología, Universidad Nacional de Colombia, Bogotá, Colombia.
3 Department of Preventive and Restorative Dental Sciences and Philip R Lee Institute for Health Policy Studies, University of California San Francisco, San Francisco, CA, USA.
4 Dental Services, Ministry of Health, Nairobi, Kenya.
5 Department Epidemiology and Public Health, WHO Collaborating Centre for Oral Health Inequalities and Public Health, University College London, London, UK.