Yang, Jun http://orcid.org/0000-0003-0971-6593
Liu, Yanli
Funding for this research was provided by:
National Nature Science Foundation of China (61373163)
the Scientific Research Fund of Sichuan Provincial Education Department (15ZA0039)
Article History
Received: 27 October 2015
Accepted: 15 June 2017
First Online: 20 September 2017
Compliance with ethical standards
:
: Authors declare that they have no conflict of interest.