1. Ph.D. Candidate, School of Public Policy and Administration, Chongqing Univ., Shapingba District, Chongqing 400044, PR China.
2. Professor, School of Public Policy and Administration, Chongqing Univ., Shapingba District, Chongqing 400044, PR China (corresponding author).
3. Assistant Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798.