Conflict of interest

Yosuke Irie, Arata Sakai, Takashi Kobayashi, Atsuhiro Masuda, Maki Kanzawa, Hirochika Toyama, and Yuzo Kodama declare that they have no conflicts of interest.

Ethical approval

All procedures adhered to the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.

Informed consent

Informed consent was obtained from the patient before being included in the study.