About the Authors
- Fufeng Qiao
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Roles Formal analysis, Funding acquisition, Investigation, Writing – original draft, Writing – review & editing
* E-mail: qiaofeng1120@gmail.com
Affiliation College of general education, Qingdao Huanghai University, Qing’ Dao, Shandong, China
Competing Interests
The authors have declared that no competing interests exist.