About the Authors
- Lan Wang
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Roles Writing – review & editing
Affiliation School of Geography, Liaoning Normal University, Dalian, China
- Daqi Liu
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Roles Conceptualization
* E-mail: bigqidq@foxmail.com
Affiliation School of Geography, Liaoning Normal University, Dalian, China
Competing Interests
The authors have declared that no competing interests exist.