1. Department of Pharmacology and Institute of Tissue Regeneration Engineering (ITREN), College of Dentistry, Dankook University, Cheonan 330-714, Korea.
2. Department of Thoracic and Cardiovascular Surgery, School of Medicine, Kyung Hee University, Seoul 130-701, Korea.
3. Department of Physical Medicine and Rehabilitation, School of Medicine, Kyung Hee University, Seoul 130-701, Korea.
4. Department of Pharmacology and Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul 130-701, Korea.