Funding for this research was provided by:
Natural Science Foundation of Henan Province (15A510018, 15A510019)
Natural Science Foundation of Henan Province (12A510002, 142102210629)
Henan University (2008YBZR028, ZZJJ20140037)
Article History
First Online: 9 August 2019
Compliance with ethical standards
:
: Author Lijia Chen declares that he has no conflict of interest. Author Mingguo Liu declares that he has no conflict of interest. Author Zan Wang declares that she has no conflict of interest. Author Zhen Dai declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.