Funding for this research was provided by:
Conselho Nacional de Desenvolvimento Científico e Tecnológico (ID0EU6AG1138)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (ID0ECBBG1139)
Received: 28 February 2017
Accepted: 5 December 2017
First Online: 16 January 2018
: The authors declare that they have no competing interests.
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