- Correspondence to Cauane Blumenberg, Post-Graduate Programme in Epidemiology, Federal University of Pelotas, Marechal Deodoro St. 1160, Pelotas, RS 96010-610, Brazil;
- Received 31 May 2017
- Revised 26 July 2017
- Accepted 8 August 2017
- Published online 7 September 2017.
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