1. Division of Applied Social Sciences, University of Missouri, Columbia, MO, USA
2. School of Humanities and Social Science, The Chinese University of Hong Kong, Shenzhen, China
3. Institute of Population and Ecology, Xiamen University, Xiamen, China
4. School of Geographical Sciences, Northeast Normal University, Changchun, China
5. College of Environment and Natural Resources, Renmin University of China, Beijing, China
6. College of Finance and Public Administration, Anhui University of Finance and Economics, Bengbu, China
7. College of Grassland and Agricultural Sciences, Lanzhou University, Lanzhou, China