Funding for this research was provided by:
National Institutes of Health (R21 EB007721 and R21 HL087119)
Received: 20 March 2017
Accepted: 30 June 2017
First Online: 23 August 2017
Ethics approval and consent to participate
: This research was performed in accordance with the Declaration of Helsinki and was approved by the Institutional Review Board of Carnegie Mellon University. Participants gave signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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