1. Department of Biology, San Diego State University, San Diego, California, USA
2. Department of Medicine, University of California San Diego, La Jolla, California, USA
3. Computational Science Research Center, San Diego State University, San Diego, California, USA
4. Department of Mathematics and Statistics, San Diego State University, San Diego, California, USA
5. Ronin Institute, Montclair, New Jersey, USA
6. Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, Illinois, USA