1. Department of Anesthesiology and Pain Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Republic of Korea
2. Department of Anesthesiology and Pain Medicine; Jukjeon Dental Hospital; Republic of Korea
3. Department of Surgery; Samsung Medical Center; Sungkyunkwan University School of Medicine; Republic of Korea
4. Department of Anesthesiology and Pain Medicine; Veterans Health Service Medical Center; Republic of Korea