1. Department of Mechanical Engineering, University of Texas at Dallas, 800 West Campbell Road EW31, Richardson, Texas 75080, USA
2. Department of Bioengineering, Center for Advanced Pain Studies, University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA
3. Department of Biomedical Engineering, University of Texas at Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA