[1] Ajou Univ, Sch Med, Dept Anesthesiol & Pain Med, Suwon 16499, South Korea
[2] Cha Univ, Sch Med, Cha Bundang Med Ctr, Dept Anesthesiol & Pain Med, Seongnam 13496, South Korea
[3] Inha Univ, Sch Med, Dept Anesthesiol & Pain Med, Incheon 22332, South Korea
[4] Hallym Univ, Coll Med, Hallym Sacred Heart Hosp, Dept Anesthesiol & Pain Med, Anyang 14068, South Korea
[5] Hallym Univ, Coll Med, Hallym Dongtan Sacred Heart Hosp, Dept Anesthesiol & Pain Med, Hwaseong 18450, South Korea
[6] Catholic Kwandong Univ, Coll Med, Int St Marys Hosp, Dept Anesthesiol & Pain Med, Incheon 22711, South Korea
[7] Korea Univ, Ansan Hosp, Dept Anesthesiol & Pain Med, Ansan 15355, South Korea
[8] Korea Univ, Anam Hosp, Dept Anesthesiol & Pain Med, Seoul 02841, South Korea
[9] Hwalgichan Orthoped Surg & Pain Clin, Seoul 03329, South Korea
[10] Ajou Univ, Med Ctr, Ajou Res Inst Innovat Med, Off Biostat, Suwon 16499, South Korea
[11] Ajou Univ, Sch Med, Dept Biomed Informat, Suwon 16499, South Korea