Received: 12 October 2020
Accepted: 10 March 2021
First Online: 29 March 2021
: Institutional review board at Kobe Kaisei Hospital (ethical approval number: 0082) approved this study and all subjects consented to participate in the study verbally, as this comparative study included no subject selection or surgical intervention. The ethics committee approved this procedure.
: Not Applicable.
: All authors declare they have no conflict of interest and competing interests.