- Correspondence to: Tonicarlo R Velasco CIREP 4° andar, Hospital das Clinicas de Ribeirão Preto, Universidade de São Paulo 14.048-900, SP, Brazil;
- Received August 18, 2005
- Accepted December 7, 2005
- Revised November 22, 2005
- First published March 16, 2006.
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