Received: 2 June 2020
Accepted: 12 November 2020
First Online: 20 November 2020
Ethics approval and consent to participate
: The design of this study was approved by the Medical Ethical Research Committee of Dokkyo Medical University Hospital (approval ID R-22-12 J). None of the patients offered to be excluded and refused to publish.
: Not applicable.
: The authors declare no conflicts of interest.