1. Associate Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 George St., Toronto, ON, Canada M5S 1A4 (corresponding author).
2. Associate Lawyer, Gowling LaFleur Henderson LLP, 100 King Street West, Suite 1600, Toronto, ON, Canada M5X 1G5.
3. University Professor and Bahen-Tanenbaum Professor, Dept. of Civil Engineering, Univ. of Toronto, 35 George St., Toronto, ON, Canada M5S 1A4.