1. Department of Biochemistry and Chemistry, Westminster College, New Wilmington, PA, USA
2. Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, USA
3. Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Chemistry and Biochemistry and Center for Computational Sciences, Duquesne University, Pittsburgh, PA, USA