Funding for this research was provided by:
National Natural Science Foundation of China (81173613)
Received: 3 July 2020
Accepted: 9 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: This research was a retrospective study without other diagnostic or therapeutic measures; therefore, informed consent was waived. But our research was approved by the Medical Ethics Review Committee of the First Affiliated Hospital of Xian jiaotong University.
: Not applicable.
: The authors declare that they have no competing interests.