1. Postdoctoral Fellow, Dept. of Economics, Jinan Univ., Guangzhou 510632, China.
2. Associate Professor, Dept. of Construction Management, Huazhong Univ. of Science and Technology, Wuhan 430074, China; Postdoctoral Fellow, Dept. of Real Estate and Construction, Univ. of Hong Kong, Knowles Bldg., Hong Kong, Hong Kong (corresponding author).
3. Associate Professor, Dept. of Real Estate and Construction, Univ. of Hong Kong, Knowles Bldg., Hong Kong, Hong Kong.