Funding for this research was provided by:
National Natural Science Foundation of Shandong (ZR2019PH040)
National Natural Science Foundation of China (81901321)
Received: 2 November 2020
Accepted: 9 February 2021
First Online: 25 February 2021
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the First Affiliated Hospital of Wenzhou Medical University, and was following the Declaration of Helsinki promulgated by the National Institute of Health. Because this study was retrospective and all included data were anonymous, the requirement that patients give informed consent was waived. Waiver of informed consent was approved by the Ethics Committee of the First Affiliated Hospital of Wenzhou Medical University.
: Not applicable.
: The authors declare no competing interests.