Document is current

Article History

First Online: 12 June 2020

Compliance with Ethical Standards

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of Keio University (approval no. 18018) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: Written informed consent was obtained from all participants before the experiment commenced.

: The authors report no potential conflicts of interest.