1. Business School, Nanjing University of Information Science & Technology, Nanjing 210044, P. R. China
2. Development Institute of Jiangbei New Area, Nanjing University of Information Science & Technology, Nanjing 210044, P. R. China
3. State Key Laboratory of Pollution Control & Resource Reuse, School of Environment Nanjing University, Nanjing 210023, P. R. China
4. The Johns Hopkins University-Nanjing, University Center for Chinese and American Studies, Nanjing 210093, P. R. China