Funding for this research was provided by:
National Natural Science Foundation of China (Project 81772706)
Article History
Received: 28 March 2019
Accepted: 6 June 2019
First Online: 13 June 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: All procedures performed were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration with its later amendments.
: Informed consent was obtained from all individual participants included in the study.