1. Associate Professor, Dept. of Economy and Management, Tianjin Univ., Room A726, Bldg. 25, No. 92 Weijin Rd., Nankai District, Tianjin 300072, China.
2. Postgraduate, Dept. of Economy and Management, Tianjin Univ., Room A726, Bldg. 25, No. 92 Weijin Rd., Nankai District, Tianjin 300072, China (corresponding author).
3. Ph.D. Candidate, Dept. of Architecture and Civil Engineering, City Univ. of Hong Kong, Block Z, Room 701, Nam Shan Bldg., Kowloon, Hong Kong 999077, China.