[1] NYU, WHO Collaborating Ctr Qual Improvement & Evidence, Coll Dent, Dept Epidemiol & Hlth Promot, New York, NY 10010 USA
[2] Univ Nacl Colombia, Fac Odontol, Dept Salud Colectiva, Bogota, Colombia
[3] Univ Calif San Francisco, Dept Prevent & Restorat Dent Sci, San Francisco, CA 94143 USA
[4] Univ Calif San Francisco, Philip R Lee Inst Hlth Policy Studies, San Francisco, CA 94143 USA
[5] Minist Hlth, Dent Serv, Nairobi, Kenya
[6] UCL, WHO Collaborating Ctr Oral Hlth Inequal & Publ Hl, Dept Epidemiol & Publ Hlth, London, England