Funding for this research was provided by:
Bloomberg Family Foundation (43003)
Received: 2 September 2019
Accepted: 18 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: All participants provided an informed written consent to participate in the study. The study was reviewed by and received ethics clearance through 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.