- Correspondence to: EDUARDO RAMOS DA SILVA, CENTRO DE CIÊNCIAS DA SAÚDE, UNIVERSIDADE DE CAXIAS DO SUL, LEOPOLDO BIER ST, 461/1804, PORTO ALEGRE, 90620-100, Brazil;
- Received 14 August 2009
- Accepted 8 November 2009
- Published in print 1 January 2009.
- Published online 2 December 2009.
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