Received: 10 October 2021
Accepted: 10 November 2021
First Online: 22 November 2021
: The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national guidelines on human medical regulations and with the Helsinki Declaration of 1975, as revised in 2008. An individual ethical approval for this study was waived according to the policy (studies in an anonymous style) of the Nara Medical University review board.
: The author and all co-authors consent to the publication of this paper.
: The authors have no conflicts of interest to disclose.