1. School of Architecture and Urban Planning, Nanjing University , Nanjing 210000, China
2. Social Sciences Area, Gran Sasso Science Institute (GSSI) , Viale F. Crispi 7, L’Aquila 67100, Italy
3. Department of Political and Social Sciences, University of Pavia , Corso Strada Nuova 65, Pavia 27100, Italy
4. Department of Management and Technology and ICRIOS, Bocconi University , Via Roentgen 1, Milan 20136, Italy
5. Department of Human Geography and Planning, Utrecht University , Princetonlaan 8A, Utrecht 3584CE, The Netherlands