1. Universidad de Guanajuato, Guanajuato, Mexico
2. Lehman College, Bronx, NY, USA
3. Oregon State University and the University of Amsterdam, Amsterdam, The Netherlands
4. Princeton University, Princeton, NJ, USA
5. Queens College, Queens, NY, USA
6. University of Arizona, Tucson, AZ, USA
7. Purdue University, South Bend, IN, USA