1. Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul 03722, Republic of Korea
2. College of Veterinary Medicine, Chonnam National University, Gwangju 61186, Republic of Korea
3. College of Health and Medical Sciences, Cheongju University, Cheongju 28503, Republic of Korea
4. Department of Precision Mechanical Engineering, Kyungpook National University, Sangju 37224, Republic of Korea
5. School of Dental Medicine, Rutgers University, Newark, NJ 07102, USA
6. Department of Dental Biomaterials, College of Dentistry, Yonsei University, Seoul 03722, Republic of Korea