Received: 11 August 2017
Accepted: 5 January 2018
First Online: 12 January 2018
Ethics approval and consent to participate
: All subjects were informed of the objective of the study and gave their written consent to participate. The study was approved by the Brazilian ethics committee of the Federal University of Alagoas, approval number 47350313.9.0000.5013.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.