Received: 20 September 2018
Accepted: 9 July 2019
First Online: 18 July 2019
Ethics approval and consent to participate
: POF 2002/2003: All ethical related questions are in conformity with the Brazilian Resolution Number 196/96 (in accordance with the Brazilian law no. 5534); POF 2008/2009: The research protocol was reviewed and approved by the Ethics Committee of the Institute of Social Medicine of the Rio de Janeiro State University (CAAE 0011.0.259.000–11) in accordance with the Brazilian law no. 5534; PNS 2013: The National Commission of Ethics in Research (CONEP) approved the PNS project on June 26, 2013 (Regulation number 328.159). The informed consent obtained was written and all respondents have agreed to take part in the research and signed a free informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.