1. Cornell University, Ithaca, NY
2. University of Bristol, UK
3. Carnegie Mellon University, Pittsburgh, PA
4. Northwestern University, Evanston, IL
5. Clausthal University of Technology in Clausthal-Zellerfeld, Germany
6. University of Colorado, Boulder, CO
7. Radboud University Nijmegen, The Netherlands
8. Technical University of Munich, Germany
9. Ben-Gurion University, Beersheba, Israel
10. Ryerson University in Toronto, Canada
11. Northwestern University in Evanston, IL
12. University of California San Diego
13. Stanford University, Stanford, CA