Hu, Xiang-Shun
Liu, Xiao-Feng
Thieme, Thomas
Zhang, Gai-Sheng
Liu, Tong-Xian
Zhao, Hui-Yan
Article History
Received: 14 August 2014
Accepted: 20 November 2015
First Online: 18 December 2015
Competing interests
: The authors declare no competing financial interests.