Funding for this research was provided by:
U.S. National Library of Medicine (R01LM012849)
National Institutes of Health (5K01ES025433)
National Institute on Drug Abuse (U01DA038360)
Received: 23 August 2019
Revised: 16 January 2020
Accepted: 26 January 2020
First Online: 4 February 2020
Compliance with Ethical Standards
: The study is original research and was not published in any form elsewhere. The study has been approved by University of Maryland Institutional Review Board. Informed consent was exempt because this study utilized publically available Twitter data and BRFSS data for secondary data analyses.
: The authors declare that they have no conflict of interest.