Li, C
Li, Q
Cai, Y
He, Y
Lan, X
Wang, W
Liu, J
Wang, S
Zhu, G
Fan, J
Zhou, Y
Sun, R
Article History
Received: 17 March 2016
Revised: 22 June 2016
Accepted: 24 June 2016
First Online: 5 August 2016
Competing interests
: This study was supported by Project of Science and Technology Department of Sichuan Province (No: 2014TD0011) and Project of Science and Technology Bureau of Chengdu (No: 2014-HM01-00415-SF). The authors declare no conflict of interest.