Zhong, Guocai http://orcid.org/0000-0002-7609-9575
Wang, Haimin
Li, Yujun
Tran, Mai H
Farzan, Michael
Article History
Received: 7 November 2016
Accepted: 6 April 2017
First Online: 19 June 2017
Competing interests
: The authors declare no competing financial interests.