[1] Univ Fed Rio Grande do Sul, Fac Med, Postgrad Program Epidemiol, BR-90035003 Porto Alegre, RS, Brazil
[2] Univ Estadual Campinas, Fac Dent Piracicaba, Dept Physiol Sci, Piracicaba, SP, Brazil
[3] Univ Fed Rio Grande do Sul, Inst Psychol, Porto Alegre, RS, Brazil