1. Department of Anaesthesiology and Pain Medicine, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Republic of Korea
2. Department of Surgery, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Republic of Korea
3. Department of Anaesthesiology and Pain Medicine, Konkuk University Medical Centre, Konkuk University School of Medicine, Seoul, Republic of Korea
4. Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Republic of Korea