Li, Honglin
Yan, Xixin
Li, Rongqin
Zhang, Aili
Niu, Zhiyun
Cai, Zhigang
Duan, Weisong
Li, Xia
Zhang, Huiran
Funding for this research was provided by:
the National Nature Science Foundation of China (81170063)
the Nature Science Foundation of Hebei province (H2012206110)