Funding for this research was provided by:
National Center for Advancing Translational Sciences (TL1 TR000422)
National Heart, Lung, and Blood Institute (5K12HL137940-02)
Received: 12 October 2019
Accepted: 13 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: This project was approved by the University of Washington Human Subjects Division (HSD #42509), the Florida State Department of Health, and the Washington State Department of Health. Data was provided by the Florida and Washington State Departments of Health through a data sharing agreement. Written informed consent for participation in this observational study of birth certificate data was not obtained from parents or guardians as obtained data was secondary and de-identified prior to acquisition by the study authors.
: Not Applicable.
: The authors declare that they have no competing interests.