Funding for this research was provided by:
Mexican National Council for Science and Technology (242065)
Text and Data Mining valid from 2018-09-20
Received: 14 June 2018
Accepted: 12 September 2018
First Online: 20 September 2018
Ethics approval and consent to participate
: All participants asked to fill written informed consent forms before study entrance. The study had been approved by local ethics committee of University of Guanajuato.
: Not applicable.
: The authors declare that they have no competing interests.
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