Gu, Xiaoya
Yu, Xiaobing
Dai, Hong
Article History
Received: 18 January 2019
Accepted: 3 July 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: The study procedures were approved by the ethics committee of Beijing Hospital. All patients provided written consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.