Funding for this research was provided by:
Text and Data Mining valid from 2020-03-20
Received: 2 October 2019
Accepted: 4 March 2020
First Online: 20 March 2020
Ethics approval and consent to participate
: The data used in this study were anonymised before analysis. Permission for use of the data from SISVEFLU was granted by Mexico’s General Directorate of Epidemiology (Ministry of Health) upon written request (DGE-DG-08137-2018).
: Not applicable.
: The authors declare that they have no competing interests.