Ding, Hongfang
Zhang, Hui
Ding, Huifang
Li, Dong
Yi, Xinhao
Ma, Xiaoxu
Li, Ruijuan
Huang, Mei
Ju, Xiuli
Article History
Received: 29 May 2015
Revised: 29 October 2015
Accepted: 30 October 2015
First Online: 28 December 2015
Competing interests
: No conflict of interest.