Gao, Hui
Niu, Zeren
Zhang, Zhi
Wu, Hongjiao
Xie, Yuning
Yang, Zhenbang
Li, Ang
Jia, Zhenxian
Zhang, Xuemei https://orcid.org/0000-0003-0705-4231
Funding for this research was provided by:
Natural Science Foundation of Hebei Province (H2017209233)
Foundation of Hebei high-level talents (A201400155)
Article History
Received: 16 September 2018
Accepted: 31 January 2019
First Online: 8 February 2019
Ethics approval and consent to participate
: All the study procedures were approved by the Ethics Committee of North China University of Science and Technology (2016134) and written informed consents were obtained from all participants of their own free will.
: Not applicable.
: The authors declare that they have no competing interests.
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