Zhang, Wenwen
Luo, Jiayan
Yang, Fang
Wang, Yucai
Yin, Yongmei
Strom, Anders
Gustafsson, Jan Åke
Guan, Xiaoxiang
Article History
Received: 9 October 2015
Accepted: 4 February 2016
First Online: 23 February 2016
Competing interests
: The authors declare no competing financial interests.