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Authors
Imai, Norio
Suzuki, Hayato
Sakagami, Atsushi
Hirano, Yuki
Endo, Naoto
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Article History
Received: 5 June 2020
Accepted: 14 October 2020
First Online: 21 October 2020
Ethics approval and consent to participate
: The ethical review board of our institution approved this study (No. 2017-0344) and waived the need for informed consent because of the retrospective, cross-sectional design of the study.
: Not applicable.
: The authors declare that they have no competing interests.
