Received: 14 March 2020
Accepted: 1 September 2020
First Online: 10 September 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the tenets of Declaration of Helsinki. Access of the data used in this research was permitted by the Ethics Committee of Beijing Tongren Hospital (TRECKY2019–097). All of the participants gave written informed consent after sufficient explanation of the whole research protocal.
: Not applicable.
: The authors declare that they have no competing interests.