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Harzheim E, Duncan BB, Stein AT, Cunha CR, Goncalves MR, Trindade TG, Oliveira MM, Pinto ME.Harzheim E, et al. Among authors: duncan bb.BMC Health Serv Res. 2006 Dec 5;6:156. doi: 10.1186/1472-6963-6-156.BMC Health Serv Res. 2006.PMID: 17147819Free PMC article.