1. Associate Professor, College of Management and Economics, Tianjin Univ., Tianjin 300072, PR China.
2. Postgraduate Student, College of Management and Economics, Tianjin Univ., Tianjin 300072, PR China.
3. Postdoctoral Fellow, Dept. of Real Estate and Construction, Univ. of Hong Kong, Hong Kong, PR China (corresponding author).
4. Professor, College of Management and Economics, Tianjin Univ., Tianjin 300072, PR China.
5. Ph.D. Candidate, College of Management and Economics, Tianjin Univ., Tianjin 300072, PR China.