1. Department of Oral & Maxillofacial Surgery, Loma Linda University School of Dentistry, Loma Linda, CA, USA.
2. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.
3. Department of Biomedical Sciences, Ajou University School of Medicine, Suwon, Korea.
4. Department of Biomaterials Science (BK21 FOUR Program), College of Natural Resources and Life Science, Pusan National University, Miryang, Korea.