Funding for this research was provided by:
Bloomberg Philanthropies (not applicable)
Received: 21 June 2019
Accepted: 8 June 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: Informed consent was obtained from each subject. The survey protocol was reviewed and approved by the Ethics Committee of the Mexican National Institute of Public Health.
: Not applicable.
: The authors declare that they have no competing interests.