Hiyama, Akihiko
Katoh, Hiroyuki
Sakai, Daisuke
Sato, Masato
Tanaka, Masahiro
Watanabe, Masahiko
Article History
Received: 4 February 2018
Accepted: 22 May 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: This investigation was designed as a single-center retrospective comparative study and was approved by the Committee on Ethics and the Institutional Review Board of Tokai University School of Medicine (17R239). We have obtained informed consent form with opt-out method from patients.
: The authors AH, HK, DS, MS, MT and MW declare that they have no competing interests.
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