1. Doctoral Candidate, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., Hung Hom, Hong Kong (corresponding author). E-mail: bsjamesw@gmail.com
2. Professor and Associate Head, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., Hung Hom, Hong Kong.
3. Associate Professor, Dept. of Building and Real Estate, The Hong Kong Polytechnic Univ., Hung Hom, Hong Kong.