- Correspondence to Dr Raul Mercer, Program of Social Sciences and Health, FLACSO (Latin American School of Social Sciences), Researcher at CISAP (Center for Research in Population Health), Buenos Aires C1026AAC, Argentina;
- Received August 3, 2014
- Revised August 22, 2014
- Accepted August 24, 2014
- First published January 22, 2015.
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