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Authors
Hirama, Takashi http://orcid.org/0000-0002-9390-5057
Tomiyama, Fumiko http://orcid.org/0000-0002-5041-4231
Notsuda, Hirotsugu http://orcid.org/0000-0003-4601-2528
Watanabe, Tatsuaki http://orcid.org/0000-0001-9104-6175
Watanabe, Yui http://orcid.org/0000-0003-0155-8754
Oishi, Hisashi http://orcid.org/0000-0002-1381-6362
Okada, Yoshinori http://orcid.org/0000-0001-7739-7657
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Article History
Received: 6 May 2021
Accepted: 9 August 2021
First Online: 13 August 2021
Declarations
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: All methods were performed in accordance with the Declaration of Helsinki. In light of the retrospective design, the requirement of informed consent was waived and the study protocol was approved by the Ethics Committee Tohoku University Graduate School of Medicine (Institutional Review Board number 2019-1-766). We disclosed information on the implementation of the research and ensured the opportunity for research subjects to refuse participation by posting the information disclosure materials approved by the Ethics Committee on the website of the Graduate School of Medicine, Tohoku University.
: Not applicable.
: The authors declare that they have no competing interests.
