Received: 9 March 2018
Accepted: 24 June 2019
First Online: 11 July 2019
Ethics approval and consent to participate
: The study protocol received ethics approval from the Ethics and Research Committee of the Federal University of Rio Grande do Norte (approval number 387.737). All participants were informed of the objectives and procedures of the research study at the time of first contact and signed a consent form, in accordance with Declaration of Helsinki and Resolution 466/12 of the National Health Council.
: Not applicable.
: The authors declare that they have no competing interests.