Received: 19 May 2021
Accepted: 28 August 2021
First Online: 8 September 2021
: The protocols of both studies were approved by the Institutional Review Board of Shimane University Hospital, Japan (study number 2821 and 3390 for study 1 and study 2, respectively). All the patients in study 1 gave written informed consent. We did not seek informed consent from patients in study 2, which was a retrospective study. The studies were conducted in accordance with the rules of the Declaration of Helsinki.
: Written informed consent for publication was also obtained from all the patients in study 1. Regarding study 2, permission to publish the results was given only from the Institutional Review Board of Shimane University Hospital.
: The authors declare that they have no competing interests.