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