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Authors
Goto, Yuya http://orcid.org/0000-0002-7603-0391
Koyama, Kansuke
Katayama, Shinshu
Tonai, Ken
Shima, Jun
Koinuma, Toshitaka
Nunomiya, Shin
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Article History
Received: 19 March 2019
Accepted: 17 June 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the local Ethics Committee of Jichi Medical University School of Medicine, and informed consent was waived because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
