1 Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon-si, 16499, Gyeonggi-do, Republic of Korea.
2 Department of Anesthesiology and Pain Medicine, Ajou University School of Medicine, Suwon-si, 16499, Gyeonggi-do, Republic of Korea. Electronic address: anesyoo@aumc.ac.kr.