Li, Mingjie
Zhi, Min
Zhu, Hai
Wu, Wen-Ya
Xu, Qing-Hua https://orcid.org/0000-0002-4153-0767
Jhon, Mark Hyunpong
Chan, Yinthai
Article History
Received: 1 April 2015
Accepted: 1 September 2015
First Online: 30 September 2015
Competing interests
: The authors declare no competing financial interests.