Nian, Qixun
Wang, Xuesheng
Wang, Manman
Zuo, Guifu
Funding for this research was provided by:
Natural Science Foundation of Hebei Province (H2017209232)
Bureau of Science and Technology of Hebei Province (ZD2018014)
Training Foundation of North China University of Science and Technology (JQ201717)
Article History
Received: 15 February 2019
Accepted: 13 June 2019
First Online: 3 July 2019
Compliance with ethical standards
: The author(s) declare that they have no competing interests. The study has been approved by the Research Council and Ethics Committee of North China University of Science and Technology, China and has been performed in accordance with the ethical standards. All participating volunteers were informed that the samples provided will be used for scientific research.