Conflict of interest

Yu Yamazaki, Hitoshi Isohata, Hiroyuki Goto, Yoshihiro Yoshimura, Kyoko Hattori, Takao Shimaoka, Kazuki Sekiguchi, Yoko Onishi, and Daigo Ochiai have no conflicts of interest to declare.

Human rights statement and informed consent

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 was obtained from this patient for being included in the study.