1. Department of Physiology, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
2. Department of Anesthesiology and Pain Medicine, Kyung Hee Medical Center, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
3. Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul, Republic of Korea