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Brenna SM, Syrjänen KJ.Brenna SM, et al. Among authors: syrjanen kj.Sao Paulo Med J. 2003 May 5;121(3):128-32. doi: 10.1590/s1516-31802003000300009. Epub 2003 Aug 8.Sao Paulo Med J. 2003.PMID: 12920476Free article.