Funding for this research was provided by:
Doctoral Program of North Sichuan Medical College (CBY16-QD-02)
key project of “Western Light” Foundation of Chinese Academy of Sciences
North Sichuan Medical College Scientific Research and Development Projects (CBY16-A-ZD02)
Article History
Received: 5 May 2017
Accepted: 18 July 2017
First Online: 4 April 2018