Conflict of interest

Takayuki Suyama, Megumi Yokoyama, Kanna Takahashi, Yasunori Matsuki, and Kazumoto Katagiri declare that they have no conflicts of interest.

Human rights statement and informed consent

All procedures were performed 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 the patient for inclusion in the study.