Xu, Guoyong
Yuan, Meng
Ai, Chaoren
Liu, Lijing
Zhuang, Edward
Karapetyan, Sargis
Wang, Shiping
Dong, Xinnian
Article History
Received: 8 September 2016
Accepted: 19 April 2017
First Online: 17 May 2017
Competing interests
: A patent based on this study has been filed by Duke University with G.X. and X.D. as inventors.