Funding for this research was provided by:
National Institutes of Health (R01HL085385)
Received: 6 October 2017
Accepted: 14 June 2018
First Online: 19 July 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the University of Arizona Institutional Review Board (protocol numbers are 1300000118 and 1200000038). Written informed consent was obtained from the subjects prior to imaging.
: Written informed consent for publication was obtained from the subjects involved in this study.
: The authors declare that they have no competing interests.
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