Funding for this research was provided by:
James S. McDonnell Foundation (#220020166)
Received: 28 August 2017
Accepted: 6 November 2017
First Online: 20 December 2017
Ethics approval and consent to participate
: The study was approved by the Washington University Institutional Review Board. At the beginning of the study, informed consent to participate was obtained from each subject. In addition, each subject was debriefed at the end of the study.
: Not applicable.
: The authors declare that they have no competing interests.
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