- Correspondence to Dr Alexandre Dias Porto Chiavegatto Filho, Department of Epidemiology, School of Public Health, University of São Paulo, Av. Dr Arnaldo, 715, São Paulo, SP 01246-904, Brazil,
- Received March 12, 2013
- Revised May 22, 2013
- Accepted July 10, 2013
- First published August 1, 2013.
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