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Authors
Nakayama, Ryuichi
Bunya, Naofumi
Tagami, Takashi
Hayakawa, Mineji
Yamakawa, Kazuma
Endo, Akira
Ogura, Takayuki
Hirayama, Atsushi
Yasunaga, Hideo
Uemura, Shuji
Narimatsu, Eichi
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Article History
Received: 21 January 2023
Accepted: 13 November 2023
First Online: 20 November 2023
Declarations
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: This study was approved by the Ethics Committee of Sapporo Medical University (Approval number: 322 − 245) on February 12, 2021. This study was conducted in compliance with the principles of the Declaration of Helsinki, approved by the ethics committees of each participating hospital, and registered at the UMIN Clinical Trials Registry (UMIN000047056). As this was a retrospective observational study using existing medical information, informed consent from each patient was waived by the Ethics Committee of Sapporo Medical University, and the patients and their relatives were guaranteed the opportunity to opt out of participation after information about the current study was published and disclosed on the hospital’s website (ExternalRef removed).
: Not applicable.
: The authors declare no competing interests.
