Funding for this research was provided by:
JSPS KAKENHI (16H05211)
Received: 31 May 2017
Accepted: 17 January 2018
First Online: 25 January 2018
Ethics approval and consent to participate
: The Institutional Review Board of the Graduate School of Medicine, the University of Tokyo, approved the study procedure (10382). Written informed consent was obtained from the participants prior to the study.
: Not applicable
: The authors declare that they have no competing interests.
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