1. Northwestern University, Evanston, IL, USA.
2. Duke University, Durham, NC, USA.
3. Harvard University, Cambridge, MA, USA.
4. University of California, Irvine, Irvine, CA, USA.
5. Stanford University, Stanford, CA, USA.
6. University of Arizona, Tuscon, AZ, USA.
7. University of Maryland, College Park, MD, USA.
8. Dartmouth College, Hanover, NH, USA.
9. Massachusetts Institute of Technology, Cambridge, MA, USA.
10. University of Illinois at Chicago, Chicago, IL, USA.
11. New York University, New York, NY, USA.