Zhang, Ran
Zhang, Xi
Chen, Yaping
Song, Weiqun
Article History
Received: 13 August 2020
Accepted: 10 May 2021
First Online: 18 May 2021
Declarations
:
: This case-control study involving human participants was performed in accordance with the ethical standards of the ethics committee of Beijing Tongren Hospital Capital Medical University and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Written consent to participate was provided by participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.