[1] Univ Southern Calif, Ctr Risk & Econ Anal Terrorism Events, Sol Price Sch Publ Policy, 379C VKC,3518 Trousdale Pkwy, Los Angeles, CA 90089 USA
[2] Ohio State Univ, Knowlton Sch Architecture, City & Reg Planning, 275 W Woodruff Ave, Columbus, OH 43210 USA
[3] Univ Southern Calif, Ctr Risk & Econ Anal Terrorism Events, Sol Price Sch Publ Policy, 1150 S Olive St,Suite 1700, Los Angeles, CA 90015 USA