1. Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institute
2. Department of Rehabilitation, Gangnam Severance Hospital
3. Department of Anesthesiology and Pain Medicine, Kyungpook National University Chilgok Hospital, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
4. Department of Anesthesiology and Pain Medicine
5. Division of Colon and Rectal Surgery, Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul