Funding for this research was provided by:
National Heart, Lung, and Blood Institute (HL090020, 1K01HL125474-02, K01-HL125514-02)
Flight Attendant Medical Research Institute (113393)
National Institute of Child Health and Human Development (HD001399)
National Institutes of Health (IL1TR000075, KL2TR000076)
Received: 7 February 2017
Accepted: 21 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: This study is a secondary analysis of publicly available data. Approval and consent have been previously acknowledged by the original studies. This use of de-identified data is allowed by Yale university without the need for institutional board approval.
: Not applicable
: The authors declare that they have no competing interests.
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