Lu, A
Fang, Y
Du, X
Li, Y
Cai, Z
Yu, K
Zhao, L
Wang, B
Wu, J
Cheng, Y
Zuo, Y
Jia, Y
Tan, F
Ding, L
Lu, J
Zhang, L
Huang, X
Article History
First Online: 26 February 2016
Competing interests
: Fenlai Tan and Lieming Ding are salaried employees of Betta Pharmaceuticals Co., Ltd. The remaining authors declare no conflict of interest.