1. School of Environment and Natural Resources, Renmin University of China, Beijing, China
2. China Anti-Poverty Research Institute, Renmin University of China, Beijing, China
3. Department of Geography and Environmental Management, Faculty of Environment, University of Waterloo, Waterloo, Ontario, Canada
4. North Minzu University, Ningxia Hui Autonomous Region, Yinchuan, China
5. Tourism Consultant, Madrid, Spain
6. School of Agricultural Economics and Rural Development, Renmin University of China, Beijing, China