1. Ph.D. Candidate, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China (corresponding author).
2. Professor, Dept. of Construction Management, Tsinghua Univ., Beijing 100084, China.
3. Professor, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.
4. Tutor, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong.