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Freitas AC, Dias JM, Parolin MB, Matias JE, Celho JC.Freitas AC, et al.Rev Col Bras Cir. 2009 Dec;36(6):487-92. doi: 10.1590/s0100-69912009000600005.Rev Col Bras Cir. 2009.PMID: 20140391Free article.Portuguese.
Coelho JC, Freitas AC, Mathias JE.Coelho JC, et al.Rev Col Bras Cir. 2009 Dec;36(6):537-8. doi: 10.1590/s0100-69912009000600015.Rev Col Bras Cir. 2009.PMID: 20140401Free article.Portuguese.