Li, Guoqiang
Gong, Ning http://orcid.org/0000-0002-9576-0381
Funding for this research was provided by:
Project supported by the National Natural Science Foundation of China (Grant No.61403331)
Natural Science Foundation of Hebei Province (Grant No. F2016203427)
Article History
Received: 3 July 2019
Accepted: 9 June 2020
First Online: 25 June 2020
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.
: Informed constant was obtained from all individual participants included in the study.