1. School of Geography and Tourism, Huizhou University, Huizhou 516007, China
2. College of Urban and Environmental Sciences, Xuchang University, No. 88 Bayi Road, Xuchang 461000, China
3. Institute for Advanced Studies in Finance and Economics, Hubei University of Economics, No. 8 Yangqiaohu Road, Wuhan 430205, China
4. College of Urban and Environmental Sciences, Central China Normal University, No. 152 Luoyu Road, Wuhan 430079, China