1. Bioelectromechanical Systems Laboratory, Virginia Tech-Wake Forest School of Biomedical Engineering, Blacksburg, Virginia, USA.
2. Bioelectromechanical Systems Laboratory, Wallace H. Coulter Department of Biomedical Engineering, Georgia Tech-Emory University, Atlanta, Georgia, USA.
3. Allen Laboratory, Department of Biomedical Sciences and Pathobiology, Virginia Tech, Blacksburg, Virginia, USA.