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