Funding for this research was provided by:
Slim Foundation for the SIGMA Project
Text and Data Mining valid from 2019-01-08
Received: 6 September 2018
Accepted: 18 December 2018
First Online: 8 January 2019
Ethics approval and consent to participate
: The study was conducted with the approval of the Ethics and Research Committees of the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán. All participants gave written informed consent before they were included in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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