1. Department
of Biomedical Engineering, Virginia Tech-Wake Forest University, School of Biomedical Engineering and Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina 27101, United States
2. Department
of Physics, Wake Forest University, Winston-Salem, North Carolina 27101, United States
3. Department
of Medicine and Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
4. Department
of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402, United States