1. Assistant Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon Tong, Hong Kong.
2. Research Student, Dept. of Building and Construction, City Univ. of Hong Kong, Tat Chee Ave., Kowloon Tong, Hong Kong.
3. Research Student, Dept. of Economics, South China Univ. of Technology, Guangzhou, Peoples' Republic of China.