Li, Jun
Yang, Lijing
Wang, Guyan
Wang, Yuefu
Wang, Chunrong
Shi, Sheng
Article History
Received: 14 June 2019
Accepted: 18 November 2019
First Online: 16 December 2019
Ethics approval and consent to participate
: This study cohort was approved by the Institutional Review of Board (IRB) of Fuwai Hospital. Informed consent from the participants was also waived by the IRB because of the retrospective nature.
: Not applicable.
: The athors declare that they have no competing interests.