1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. Department of Public Governance, Qianhai Institute for Innovative Research, Shenzhen 518052, China
3. School of Public Policy and Management, University of Chinese Academy of Sciences, Beijing 100049, China
4. School of Mathematics and Physics, Anhui Polytechnic University, Wuhu 241000, China