Funding for this research was provided by:
Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32HD095134, P2C HD041023)
Received: 26 October 2020
Accepted: 30 January 2021
First Online: 15 March 2021
Ethics approval and consent to participate
: Not applicable. As a secondary study of de-identified county-level data, this research does not involve individual human subjects.
: Not applicable.
: The authors declare that they have no competing interests.