1. Belfer Center for Science and International Affairs, Kennedy School of Government, Harvard University, Cambridge, MA 02138, USA.
2. Media Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3. Department of Psychiatry, Massachusetts General Hospital, Boston, MA 02114, USA.
4. Harvard Medical School, Boston, MA 02115, USA.
5. San Diego State University/University of California San Diego Joint Doctoral Program in Clinical Psychology, San Diego, CA 92182, USA.
6. Department of Psychology, University of California, Riverside, Riverside, CA 92521, USA.
7. Departments of Political Science and Medicine, University of California, San Diego, La Jolla, CA 92093, USA.