Liu, Duo
Tian, Yuyang
Sun, Donglin
Sun, Haiming
Jin, Yan
Dong, Mei
Funding for this research was provided by:
the Fund of the Outstanding Youth foundation of Heilongjiang Province of China (JC201215)
the Science and Technology Research Project of Chinese Ministry of Education (213010A)
Heilongjiang Province Education Department project (2012CJHB007)