Funding for this research was provided by:
Bloomberg Family Foundation (43003)
Text and Data Mining valid from 2020-04-06
Received: 4 September 2019
Accepted: 18 March 2020
First Online: 6 April 2020
Ethics approval and consent to participate
: All participants provided an informed written consent to participate in the study. The study was reviewed and approved by the Ethics, Biosafety and Research Commissions of the Mexican National Institute of Public Health (approval number: 1122).
: Not applicable.
: The authors declare that they have no competing interests.