1. Department of Materials Science and Engineering, The Ohio State University , Columbus, OH , USA
2. Center for Electron Microscopy and Analysis, The Ohio State University , Columbus, OH , USA
3. Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson AFB, OH , USA
4. Division of Biosciences, Ohio State University College of Dentistry , Columbus, OH , USA
5. Department of Biologic and Materials Sciences, University of Michigan School of Dentistry , Ann Arbor, MI , USA
6. Department of Anatomy and Cell Biology, Faculty of Medicine and Health Sciences, McGill University , Montreal, QC , Canada