Following the publication of this article [1], we observed that a co-author, Dr. Weslei de Souza, was absent from the authors list. The submitting authors would like to apologise to Dr. Weslei de Souza for this mistake. We have updated the Authors' contributions and Competing interests sections in order to reflect this correction.
Competing interests
The authors declare that they have no competing interests.
Authors' contributions
MF, VEV, JRC, CF, AM, CFF, JRB, JAC, CBMM., HMJ, NM, WS and LCA designed research, analyzed data, and wrote the paper. All authors read and approved the final manuscript.
Authors: Marcelo Ferreira; Vitor E Valenti; Jose R Cisternas; Celso Ferreira; Adriano Meneghini; Celso Ferreira Filho; João R Breda; João A Correa; Carlos Bandeira de Mello Monteiro; Hugo Macedo Junior; Neif Murad; Luiz Carlos de Abreu Journal: Int Arch Med Date: 2011-01-22