Yan, C
Yang, H
Wang, Y
Dong, Y
Yu, F
Wu, Y
Wang, W
Adaku, U
Lutfy, K
Friedman, T C
Tian, S
Liu, Y
Article History
Received: 20 August 2015
Revised: 14 March 2016
Accepted: 22 March 2016
First Online: 22 April 2016
Competing interests
: The authors declare no conflict of interest.