1. Graduate Student, Dept. of Civil Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4.
2. Assistant Professor, Civil Architectural and Environmental Engineering, Drexel Univ., 3141 Chestnut St., Philadelphia, PA 19104.
3. Associate Professor, Dept. of Civil Engineering and School of Public Policy and Governance, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4 (corresponding author).