Received: 27 January 2020
Accepted: 19 June 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of the First Affiliated Hospital of Xi’an Jiaotong University (No: XJTU1AF2020LSK-049). Waiving of informed consent was obtained due to the retrospective noninterventional study design.
: Not applicable.
: The authors declare that they have no competing interests.