Funding for this research was provided by:
National Center for Injury Prevention and Control (R49 CE003095-01)
Article History
Received: 8 December 2019
Accepted: 7 September 2020
First Online: 25 September 2020
Ethics approval and consent to participate
: This study was determined to be exempted from Human Subject Office review because the data are publicly available and de-identified. This determination was made by the University of Iowa Human Subject Office.
: Not applicable.
: Authors have no competing interests.