- Correspondence to Dr Denise P Gigante, Post-Graduate Programme in Epidemiology, Federal University of Pelotas, Marechal Deodoro 1160, Pelotas, RS 96020220, Brazil;
- Received December 14, 2014
- Revised April 14, 2015
- Accepted May 4, 2015
- First published June 24, 2015.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.