Funding for this research was provided by:
Takeda Science Foundation (2019)
Kurozumi Medical Foundation (2019)
Grant-in-Aid for Scientific Research C (20K08509)
Received: 17 April 2020
Accepted: 21 September 2020
First Online: 2 October 2020
Ethics approval and consent to participate
: The study protocol was reviewed by the Institutional Review Board (IRB) at Tohoku University Hospital (IRB number 2019-01-54). In light of the retrospective design, the requirement of informed consent was waived. 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.