作者单位:NYU, Coll Dent, Dept Epidemiol & Hlth Promot, 433 First Ave,7th Floor, New York, NY 10010 USA[1]Univ Western Cape, Dept Community Dent, Fac Dent, Cape Town, South Africa[2]Hlth Bur Ltd, Buckingham, England[3]Aide Odontol Int, Montrouge, France[4]