Funding for this research was provided by:
National Institutes of Health (K08 HL132106, DP2 MD010478)
Received: 4 July 2018
Accepted: 25 March 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: Ethics approval was provided by the Stanford Institutional Review Board (protocol #31603). Ethics approval for the NLSY was provided by the institutional review boards of Ohio State University and the National Opinion Research Center at the University of Chicago, and by the U.S. Office of Management and Budget. Written informed consent was obtained from study subjects for their participation in the NLSY.
: Not applicable.
: The authors declare that they have no competing interests.
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