Conflicts of interest

Mayu Nakamoto, Toru Ariyoshi, Kaori Murakawa, Hitoshi Nagai, Ayumi Omuro, Shinichi Okuda, and Motoaki Sano declare that they have no conflicts of interest.

Human rights

All procedures performed in this study were done in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national), as well as the Helsinki Declaration of 1964 and its later amendments.

Informed consent

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