1. International Security Program and Project on Managing the Atom, Belfer Center for Science and International Affairs, John F. Kennedy School of Government, Harvard University, Cambridge, MA, USA;
2. Nuclear Knowledge Program, Center for International Studies (CERI), Sciences-Po, Paris, France;
3. Program on Science and Global Security, Princeton University, Princeton, NJ, USA;
4. Center for Information Technology Policy, Princeton University, Princeton, NJ, USA