1. Department of Physiology, Kyung Hee University College of Medicine, Seoul, Korea.
2. Department of Anesthesiology and Pain Medicine, Kyung Hee University College of Medicine, Seoul, Korea.
3. Department of Oriental Sports Medicine, College of Health & Therapy, Daegu Haany University, Kyeongsan, Korea.
4. Department of Anesthesiology and Pain Medicine, Kyung Hee University, East-West Neo Medical Center, Seoul, Korea.