Hiyama, Akihiko
Katoh, Hiroyuki
Sakai, Daisuke
Sato, Masato
Tanaka, Masahiro
Watanabe, Masahiko
Article History
Received: 2 October 2019
Accepted: 5 December 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Committee on Ethics and the Institutional Review Board of Tokai University School of Medicine (18R-315), the House Clinical Study Committee, and the Profit Reciprocity Committee. Because this study was retrospective, we have obtained informed consent form with opt-out method from all patients.
: Not applicable.
: The authors declare that they have no competing interests.