Chen, Ping
Wang, Weiyi
Zhang, Yongping
Yuan, Yaozong
Wu, Yunlin
Funding for this research was provided by:
Supported by National Natural Science Foundation of China (81170437)
Article History
Received: 25 April 2015
Accepted: 27 October 2015
First Online: 18 November 2015
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.