Pan, Shenggang
Liu, Haidong
Mo, Zhaowen
Patterson, Bob
Duan, Meiyang
Tian, Hua
Hu, Shuijin
Tang, Xiangru
Article History
Received: 5 May 2016
Accepted: 3 August 2016
First Online: 25 August 2016
Change Date: 30 March 2017
Change Type: Update
Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has been fixed in the paper.
Competing interests
: The authors declare no competing financial interests.