1. School of Materials Science & Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
2. Department of Metal Powder, Korea Institute of Materials Science, 51508 Changwon, South Korea
3. Department of Prosthodontics, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
4. Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, United States