[1] Grp Hosp Conceicao, Av Francisco Trein 596, BR-91350200 Porto Alegre, RS, Brazil
[2] Pontificia Univ Catolica Rio Grande do Sul, Programa Posgrad Med & Ciencias Saude, Porto Alegre, RS, Brazil
[3] Univ Fed Rio Grande do Sul UFRGS, Programa Posgrad Odontol, Porto Alegre, RS, Brazil
[4] Univ Fed Rio Grande do Sul, Programa Posgrad Epidemiol, Porto Alegre, RS, Brazil
[5] Grp Hosp Conceicao, Serv Saude Comunitaria & Programa Posgrad Modalid, Porto Alegre, RS, Brazil
[6] Univ Fed Rio Grande do Sul, Fac Odontol, Dept Odontol Prevent & Social, Porto Alegre, RS, Brazil