Funding for this research was provided by:
National Natural Science Foundation of China (No. 81572988)
Science & Technology Department of Sichuan Province Funding Project (No. 2016FZ0108, 2018SZ0117)
Article History
Received: 24 March 2019
Accepted: 22 April 2019
First Online: 30 April 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The manuscript does not contain clinical studies or patient data.
: Informed consent was obtained from all individual participants included in the study.