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Authors
Watanabe, Yuko
Saito, Yoshitaka
Mitamura, Takashi
Takekuma, Yoh
Sugawara, Mitsuru https://orcid.org/0000-0001-5350-2950
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Article History
Received: 28 December 2020
Accepted: 3 April 2021
First Online: 1 June 2021
Declarations
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: This retrospective study was approved by the Institutional Review Board of the Hokkaido University Hospital (approved number: 018–0390). All the procedures performed in studies involving human participants were out 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. For this type of study, formal consent is not required.
: Not applicable.
: The authors declare no conflicts of interest associated with this manuscript.
