Received: 1 December 2020
Accepted: 19 January 2021
First Online: 20 February 2021
Ethics approval and consent to participate
: In accordance with the declaration of Helsinki, this retrospective study was approved by the Ethics Committee of Medical Plaza Daido Central (approval number 34–2020). Because only the medical records were reviewed, this study was exempted from signing the informed consent.
: Regarding publication of the research results, we explained that we could not reveal personal information and obtained verbal consent from all target patients.
: The authors declare no conflict of interest.