Zheng, Pei-Pei
Yao, Si-Min
He, Wei
Wan, Yu-Hao
Wang, Hua
Yang, Jie-Fu
Article History
Received: 21 December 2020
Accepted: 4 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: The study was performed in accordance with the Declaration of Helsinki and all participants signed their informed consent prior to data collection. The study protocol was approved by the Ethics Committee of Beijing Hospital (No. 2018BJYYEC-121-02).
: Not applicable.
: All authors state that they have no competing interests.