1. Institute for Quantitative Biomedicine, Rutgers, State University of New Jersey , 174 Frelinghuysen Road , Piscataway , NJ 08854 , USA
2. Research Collaboratory for Structural Bioinformatics Protein Data Bank, Rutgers, The State University of New Jersey , Piscataway , NJ 08854 , USA
3. Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway , NJ 08854 , USA
4. Department of Quantitative and Computational Biology, University of Southern California , Los Angeles , CA 90089 , USA
5. Department of Mathematics and Statistics, Bowling Green State University , Bowling Green , OH 43403 , USA