Funding for this research was provided by:
National Natural Science Foundation of China (81472277)
Received: 28 March 2020
Accepted: 9 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. The retrospective study was approved by the Ethics Committee of Changhai Hospital. The informed consent requirement was waved.
: Not applicable.
: The authors declare that they have no competing interests.