1. Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina 27695-7908, United States
2. Department of Forest Resources Management, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
3. Civil & Environmental Engineering, University of Washington, Seattle, Washington 98195-2700, United States
4. Stockholm Environmental Institute─US Centre, Somerville, Massachusetts 02144-1224, United States