Michito Murayama, Suguru Ishizaka, Keita Sakaguchi, Rion Ando, Hisao Nishino, Sanae Kaga, and Toshihisa Anzai declare that they have no conflict of interest.

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 the patient for being included in the study.