Hu, X.
Shang, J.
Yuan, W.
Zhang, S.
Jiang, Y.
Zhao, B.
Duan, Y.
Xiao, J.
Zhao, Z.
Article History
Received: 3 March 2017
Revised: 16 July 2017
Accepted: 16 July 2017
First Online: 23 August 2017
Compliance with ethical guidelines
:
: X. Hu, J. Shang, W. Yuan, S. Zhang, Y. Jiang, B. Zhao, Y. Duan, J. Xiao, and Z. Zhao declare that they have no competing interests.
: This article does not contain any studies with human participants or animals performed by any of the authors.