1. Center for Human Geography and Urban Development, School of Geography and Remote Sensing, Guangzhou University, Guangzhou, Guangdong, China
2. Guangdong Provincial Center for Urban and Migration Studies, Guangzhou, Guangdong, China
3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, Guangdong, China
4. Sociology Department, School of Sociology and Anthropology, Xiamen University, Fujian, China