Funding for this research was provided by:
National Natural Science Foundation of China (81770730)
Natural Science Foundation of Hunan Province (2017JJ2352)
Article History
Received: 27 March 2020
Accepted: 25 July 2020
First Online: 1 August 2020
Compliance with ethical standards
:
: The authors have no conflicts of interest to declare.
: The study protocol has been approved by the research institute’s committee on human research. The requirement of informed consent was waived by the review board (no. 2019011).