1. University of Oregon, Eugene, OR, USA
2. University of Parma and Italian Institute of Technology, Parma, Italy
3. University of California–Santa Barbara, Santa Barbara, CA, USA
4. University of Pittsburgh, Pittsburgh, PA, USA
5. University College London, London, United Kingdom
6. University of Southern California, Los Angeles, CA, USA
7. Washington University in St. Louis, St Louis, MO, USA
8. James S. McDonnell Foundation, St Louis, MO, USA