Conflict of interest

Ayako Okazaki, Keisuke Miyajima, Yoshitaka Kawaguchi, Yasushi Wakabayashi, and Mitsuru Asano declare that they have no conflict of interest.

Human and animal rights

All procedures followed were in accordance with 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.