Wu, H
Zhang, X-Y
Hu, Z
Hou, Q
Zhang, H
Li, Y
Li, S
Yue, J
Jiang, Z
Weissman, S M
Pan, X
Ju, B-G
Wu, S
Article History
Received: 15 July 2016
Revised: 22 September 2016
Accepted: 4 October 2016
First Online: 12 December 2016
Competing interests
: The authors declare no conflict of interest.