1. Postdoctoral Fellow, Dept. of Real Estate and Construction, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, P.R. China (corresponding author).
2. Head, Dept. of Real Estate and Construction, Univ. of Hong Kong, Pokfulam Rd., Hong Kong, P.R. China.
3. Professor, School of Civil and Building Engineering, Loughborough Univ., Loughborough LE11 3TU, U.K.