1. Department of Biomedical Engineering; Vanderbilt University; Nashville TN 37235 USA
2. Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology; School of Dentistry; Kyung Hee University; Seoul 02447 Republic of Korea
3. Department of Oral and Maxillofacial Surgery; Kyung Hee University Dental Hospital at Gang-dong; Seoul 05278 Republic of Korea