Jiang, Hongyan
Chen, Yang
Sun, Peizhen
Li, Chen
Funding for this research was provided by:
the Fundamental Research Funds for the Central Universities (2017WB03)
Article History
First Online: 2 November 2017
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 China University of Mining and Technology research committee and with the Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.