1. Department of Periodontology, Research Institute of Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea.
2. Department of Clinical Pharmacology and Therapeutics, Kyung Hee University College of Medicine, Seoul, Korea.
3. Department of Biomedical Science and Technology, Kyung Hee Medical Science Research Institute, Kyung Hee University, Seoul, Korea.