Matsumoto, Teppei
Hatakeyama, Shingo http://orcid.org/0000-0002-0026-4079
Ookubo, Teppei
Mitsuzuka, Koji
Narita, Shintaro
Inoue, Takamitsu
Yamashita, Shinichi
Narita, Takuma
Koie, Takuya
Kawamura, Sadafumi
Tochigi, Tatsuo
Tsuchiya, Norihiko
Habuchi, Tomonori
Arai, Yoichi
Ohyama, Chikara
Funding for this research was provided by:
Japan Society for the Promotion of Science (15H02563, 15K15579, 17K11118, 17K11119, 17K11119, 17K16768, 17K16770, 17K16771)
Article History
Received: 3 October 2017
Accepted: 23 October 2017
First Online: 31 October 2017
Compliance with ethical standards
:
: The authors declare no conflicts of interests.
: This retrospective study was performed in accordance with the ethical standards of the Declaration of Helsinki and approved by each institutional review board of Hirosaki University, Tohoku University, Akita University, and Miyagi Cancer Center.
: For this type of study, formal written consent is not required. Pursuant to the provisions of the ethics committee and the ethic guideline in Japan, written consent was not required in exchange for public disclosure of study information in the case of retrospective and/or observational study using a material such as the existing documentation. The study information was open for the public consumption at ExternalRef removed.