1. Department of Materials Science and Engineering, McMaster University, Hamilton, ON, L8S 4L8, Canada
2. Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. Canadian Centre for Electron Microscopy, McMaster University, Hamilton, ON, L8S 4L8, Canada
4. School of Biomedical Engineering, McMaster University, Hamilton, ON, L8S 4L8, Canada