1. Department of Physics, Pennsylvania State University, University Park, Pennsylvania.
2. Department of Computer Science, University of Illinois at Chicago, Chicago, Illinois.
3. Dipartimento di Scienze dei Linguaggi della Comunicazione e degli Studi Culturali, Università degli Studi di Bergamo, Bergamo, Italy.
4. Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois.
5. Department of Mathematics, Rutgers University, New Brunswick, New Jersey.
6. Department of Computer Science, Georgia State University, Atlanta, Georgia.