Conflict of interest
Saori Miyajima, Kunihiro Tsuji, Yosuke Kito, Naohiro Yoshida, Kazuhiro Matsunaga, Shigetsugu Tsuji, Kazuyoshi Katayanagi, Miwa Yonezawa, Anna Kubo, Kahori Ushijima Hiroshi Minato and Hisashi Doyama declare that they have no conflict of interest.
Human rights
All procedures followed have been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
Informed consent
Informed consent was obtained from the patient for being included in the study.