Funding for this research was provided by:
National Natural Science Foundation of China (81571664, 81871323, 81801665)
China Postdoctoral Science Foundation (2016M600145)
National Natural Science Foundation of Guangdong Province (2018B030311024)
Scientific Research General Project of Guangzhou Science Technology and Innovation Commission (201707010328)
Received: 2 December 2019
Accepted: 12 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: This retrospective study was approved by the Institutional Review Board and the informed consent requirement was waived.
: Not Applicable.
: The authors declared that they have no competing interests.