Funding for this research was provided by:
Capes PEC-PEG (12578-13-4)
Received: 8 December 2016
Accepted: 7 February 2018
First Online: 20 February 2018
Ethics approval and consent to participate
: Not applicable as anonymised secondary data was used in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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