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Article History

Received: 13 May 2021

Accepted: 2 April 2022

First Online: 15 April 2022

Declarations

:

: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. The study protocol was approved by the institutional review board of each participating hospital [Tottori University Hospital ethics committee (20A014); Japanese Red Cross Tottori Hospital ethics committee (82); Masuda Red Cross Hospital medical ethics committee (78); Tottori Prefectural Central Hospital ethics committee (2020–38); Hamada Medical Center ethics committee (226); Tottori Rrefectural Kousei Hospital ethics committee (208); Matsue City Hospital ethics committee (2B-0005); Yonago Medical Center ethics committee (0209–06); Sanin Rosai Hospital ethics committee (2020–12)]. Because this study is retrospective study and used anonymous clinical data that were obtained after each patient agreed to treatment by written consent, patients were not required to give informed consent to the study. We also applied opt-out method to obtain consent on this study through the website, which was approved by the institutional review board of each participating hospital.

: Not applicable.

: The authors declare that they have no competing interests.