1. Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston−Salem, North Carolina 27157, United States
2. Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
3. School of Biomedical Engineering and Sciences, Wake Forest University−Virginia Tech, Winston-Salem, North Carolina 27157, United States