[1] Georgetown Univ, Ctr Secur Studies, Washington, DC 20057 USA
[2] Brookings Inst, Washington, DC 20036 USA
[3] Harvard Univ, Belfer Ctr Sci & Int Affairs, Cambridge, MA 02138 USA
[4] Harvard Univ, Sch Business, Cambridge, MA 02138 USA
[5] Washington Inst Near East Policy, Washington, DC USA