Tanaka, Hisashi http://orcid.org/0000-0003-2009-0210
Taima, Kageaki
Itoga, Masamichi
Ishioka, Yoshiko
Baba, Keisuke
Shiratori, Toshihiro
Sakamoto, Hiroaki
Tsuchiya, Junichiro
Nakagawa, Hideyuki
Hasegawa, Yukihiro
Yasugahira, Hideo
Okudera, Koichi
Takanashi, Shingo
Tasaka, Sadatomo
Article History
Received: 25 February 2019
Accepted: 26 April 2019
First Online: 14 May 2019
Compliance with ethical standards
:
: All authors declared that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the institutional review boards of all participating institutions. (approval number: 2016-1108).
: Because this was a retrospective cohort study, informed consent was waived. Opt out was done on the web site of Hirosaki University.