1. Department of Physics, University of Florida, Gainesville, Florida 32611, United States
2. Laboratory for Biomolecular Simulation Research, Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, United States
3. Department of Chemistry and Laufer Center for Physical and Quantitative Biology, Stony Brook University, Stony Brook, New York 11794, United States
4. Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States