Funding for this research was provided by:
National Heart, Lung, and Blood Institute (R01HL091002)
Received: 6 July 2018
Accepted: 6 March 2019
First Online: 18 March 2019
Ethics approval and consent to participate
: Written informed parental consent was obtained from all study participants. The University of South Carolina Institutional Review Board approved all study protocols (reference number: Pro00003730).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.