Conflict of interest

Mayu Nakamoto, Ayumi Omuro, Hitoshi Uchinoumi, Yasuaki Wada, Nobuaki Tanaka, and Masafumi Yano declare that they have no conflict 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 with the Declaration of Helsinki of 1964 and later versions.

Informed consent

Informed consent was obtained from all patients for being included in the study.