Zhang, Qidong
Yue, Juan
Wang, Weiguo
Chen, Yan
Zhao, Qichao
Guo, Wanshou
Funding for this research was provided by:
the capital health research and development of special (2016-2-4062)
Article History
Received: 25 November 2017
First Online: 4 May 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.