Received: 6 February 2020
Accepted: 23 May 2020
First Online: 29 May 2020
Ethics approval and consent to participate
: This research (Protocol IRB19-2073) has been reviewed by the Harvard T. H. Chan School of Public Health Institutional Review Board (FWA00002642) and was determined to be exempt from the IRB process given that it involves open-source data and is not explicitly human subjects research.
: Not applicable.
: The authors declare that they have no competing interests.