Article History
Received: 20 May 2021
Accepted: 24 June 2021
First Online: 3 July 2021
Declarations
:
: This retrospective study was conducted according to the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. All participants have signed written informed consent form. Ethical approval (No. 2015-425) was obtained from the Ethics Committee of the First Affiliated Hospital, School of Medicine, Zhejiang University.
: Not applicable.
: The authors declare that they have no competing interests.