Liu, Xiangchun
Liu, Haiying
Sun, Lina
Chen, Zhixin
Nie, Huibin
Sun, Aili
Liu, Gang
Guan, Guangju
Funding for this research was provided by:
innovation fund of Shandong University (2012DX004)
National Natural Science Foundation of China (81100509)
Article History
Received: 1 September 2015
Revised: 22 March 2016
Accepted: 12 April 2016
First Online: 30 April 2016