1. Laboratory and Research Centre, SAAM, 718 Avenida do Coselheiro Borja, Macau
2. ASTRAN, Menara Keck Seng No. 203, Jalan Bukit Bintang, 55100 Kuala Lumpur, Malaysia
3. Dept. of Environmental Engineering, Tsinghua University, Beijing 100084, P. R. China
4. Dept. of Civil Engineering, National University of Singapore, Singapore 119260