Affiliation: | 1. Department of Anesthesiology and Pain Medicine, Seoul National University College of Medicine, Seoul National University Hospital, 101 Daehak-Ro Jongno-Gu, Seoul, 03080, South Korea;2. Department of Information Statistics, Andong National University, 1375 Gyeongdong-Ro Andong, Gyeongsangbuk-do, 36729, South Korea;3. Department of Statistics, Kyungpook National University, 80 Daehak-Ro, Daegu, 41566, South Korea |