Funding for this research was provided by:
National Heart, Lung, and Blood Institute (T-32-HL-125-294-01A1)
National Institute on Aging (P30AG059299, 3R01AG048642-04S1)
Received: 3 January 2019
Accepted: 19 June 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: The Institutional Review Boards of each study site institutions and coordinating centers approved the study protocol. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests to report.