Shijubou, Naoki http://orcid.org/0000-0001-8005-1745
Sumi, Toshiyuki http://orcid.org/0000-0002-2540-5878
Yamada, Yuichi http://orcid.org/0000-0002-9080-4496
Nakata, Hisashi http://orcid.org/0000-0003-3900-8117
Mori, Yuji http://orcid.org/0000-0002-2523-6752
Chiba, Hirofumi http://orcid.org/0000-0002-7033-3084
Article History
Received: 5 August 2021
Accepted: 2 February 2022
First Online: 9 April 2022
Declarations
:
: The authors declare that they have no conflict of interest.
: Not applicable.
: This study was conducted with the approval of the Institutional Review Board (IRB) of Hakodate Goryokaku Hospital (No. 2021–015), and was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: As this was a retrospective study, the IRB waived the requirement for informed consent, but patient confidentiality was protected.
: Not applicable.