Received: 11 May 2021
Accepted: 29 August 2021
First Online: 8 September 2021
: The Ethics Committee of the Kinki Central Hospital of Mutual Aid Association of Public School Teachers approved this prospective study on 18 January 2016 (approval no. 276), 27 October 2018 (approval no. 364), and 18 June 2021 (approval no. 421). This study complied with the international ethical recommendations of the Declaration of Helsinki. Written informed consent was obtained from all patients studied.
: Not applicable.
: The authors declare that they have no competing interests.