1Department of Biomedical Engineering, Pennsylvania State University, University Park, PA, USA
2The Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA, USA
3Engineering Science and Mechanics Department, Penn State University, University Park, PA, USA
4Materials Research Institute, Pennsylvania State University, University Park, PA, USA
5Department of Neurosurgery, Pennsylvania State College of Medicine, Hershey, PA, USA
