1. Ph.D. Candidate, College of Management and Economics, Tianjin Univ., Tianjin 300072, People’s Republic of China.
2. Assistant Professor, School of Building Construction, Georgia Institute of Technology, Atlanta, GA 30308.
3. Professor, College of Management and Economics, Tianjin Univ., Tianjin 300072. People’s Republic of China (corresponding author).
4. Ph.D., College of Management and Economics, Tianjin Univ., Tianjin 300072. People’s Republic of China.