Funding for this research was provided by:
Japan Society for the Promotion of Science (24247045, 16K14822)
Received: 19 July 2017
Accepted: 21 November 2017
First Online: 4 December 2017
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The experimental procedures used in this study were approved by the Ethics Committee of the Graduate School of Engineering of Chiba University (receipt no. 26-29). Informed consent was obtained from all participants prior to their beginning of the experiment.
: Personal information was removed from the data so that an individual person cannot be identified by the published data. All participants consented to publication of the data that have no personal information.
: The authors declare that they have no competing interests.
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