Conflict of interest

Nao Oda, Hiroki Matsuzoe, Shunsuke Sato, Ryo Nishio, Daisuke Matsumoto, Takashi Azami, and Hiroshi Takaishi declare no conflicts of interest.

Human rights statement

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

Informed consent

Informed consent was obtained from the patient for inclusion in this case report.