1. Department of Anesthesiology and Pain Medicine, Wonkwang University School of Medicine Hospital, 895 Muwang-ro, Iksan 54538, Republic of Korea
2. Department of Obstetrics and Gynecology, Wonkwang University School of Medicine Hospital, 895 Muwang-ro, Iksan 54538, Republic of Korea
3. Department of Nursing, Wonkwang University School of Medicine Hospital, 895 Muwang-ro, Iksan 54538, Republic of Korea
4. Department of Anesthesiology and Pain Medicine, Konkuk University Medical School, 82 Gugwondae-ro, Chungju 27376, Republic of Korea