Li, Chuzhong
Zhu, Haibo
Zong, Xuyi
Wang, Xinsheng
Gui, Songbai
Zhao, Peng
Liu, Chunhui
Bai, Jiwei
Cao, Lei
Zhang, Yazhuo
Article History
Received: 7 January 2020
Accepted: 29 April 2020
First Online: 4 June 2020
Ethics approval and consent to participate
: KY2013-015-02: The ethics committee of Beijing Tiantan Hospital approved this retrospective analysis and waived the requirements for informed consent on the basis of study design.
: Not applicable.
: The authors declare that they have no competing interests.