Authors DOI: https://doi.org/10.1590/S0034-89101991000400015 Downloads PDF (Portuguese) Published 1991-08-01 Issue Vol. 25 No. 4 (1991) Section Erratum How to Cite (1991). Revista De Saúde Pública, 25(4), 0-0. https://doi.org/10.1590/S0034-89101991000400015 More Citation Formats ACM ACS APA ABNT Chicago Harvard IEEE MLA Turabian Vancouver AMA Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX