Conflict of interest

Haruka Noma, Naoyuki Otani, Shigeru Toyoda, and Takanori Yasu declare that they have no conflicts of interest.

Ethical approval

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Declaration of Helsinki of 1964 and later versions.

Informed consent

The study participant gave informed consent for all procedures and for publication of this report.