1. Department of Anesthesiology and Pain Medicine, College of Medicine, Ewha Womans University, 260, Gonghang-daero, Gangseo-gu, Seoul 07804, Republic of Korea
2. Department of Anesthesiology and Pain Medicine, Ewha Womans University Mokdong Hosptial, 1071, Anyangcheon-ro, Yangcheon-gu, Seoul 07985, Republic of Korea
3. Department of Thoracic and Cardiovascular Surgery, Ewha Womans University Seoul Hospital, 260, Gonghang-daero, Gangseo-gu, Seoul 07804, Republic of Korea