[1] Chungnam Natl Univ Hosp, Dept Anesthesiol & Pain Med, Daejeon 35015, South Korea
[2] Chungnam Natl Univ, Coll Med, Dept Anesthesiol & Pain Med, Daejeon 34134, South Korea
[3] Chungnam Natl Univ Hosp, Biomed Res Inst, Big Data Ctr, Daejeon 35015, South Korea