Received: 28 February 2021
Accepted: 7 June 2021
First Online: 16 August 2021
: The study was conducted according to the guidelines of the Declaration of Helsinki and approved by the Ethics Committee of Suiyukai (protocol code 014, March 15th, 2019). Written informed consent was obtained from all subjects involved in the study.
: Not applicable.
: The authors declare no competing interests.