Xu, Jiuping
Wang, Yan
Tang, Wanjie
Funding for this research was provided by:
the Propaganda Department of People’s Republic of China (No. 2016zybw03)
the Major Bidding Program of National Social Science Foundation of China (No. 17ZDA286)
Article History
Received: 14 September 2017
Accepted: 28 February 2018
First Online: 6 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: This project was approved by the Research Ethics Committee of Sichuan University, the Research Ethics Committee of the West China Hospital of Sichuan University, and the Education Bureau of Lushan, Tianquan, and Baoxing Counties. The study was conducted in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.