1. Research Student, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., TU 530 Hung Hom, Kowloon, Hong Kong, People’s Republic of China (corresponding author).
2. Professor, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., TU 530 Hung Hom, Kowloon, Hong Kong, People’s Republic of China.
3. Associate Professor, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., TU 530 Hung Hom, Kowloon, Hong Kong, People’s Republic of China.