1. Department of Anesthesiology and Pain Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Anesthesia and Pain Research Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Yonsei Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Anesthesiology and Pain Medicine, Gil Medical Center, Gachon Medical School, Incheon, Korea.