He, Xue-Rui
Liu, Zheng
Wei, Jing
Li, Wan-Jun
Liu, Tao
Funding for this research was provided by:
The key research and development program of Shaanxi Province (2017ZDXM-SF-067)
Article History
Received: 15 July 2017
Accepted: 20 January 2018
First Online: 30 January 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.