Qiao, Ting-ting
Zheng, Wei
Xing, Wei
Zhang, Li-xia
Zhang, Wei
Shi, Yan-ping
Chen, Xiao-juan
Article History
Received: 17 June 2016
Accepted: 28 November 2016
First Online: 5 December 2016
Compliance with ethical standards
:
: The authors declare that they have no conflicts 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.
: All participants signed informed consent form at study onset, according to the recommendations of the Research Ethics Committee at Zhengzhou University.