Funding for this research was provided by:
Natural Science Foundation of Hainan Province (317258)
Article History
Accepted: 13 May 2020
First Online: 1 June 2020
Compliance with ethical standards
:
: This is to confirm that this manuscript was not submitted for publication to any other journal. It is only submitted to this journal, EJPP. The authors declare that they have 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.