title: In response.
authors.affiliation: Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea jintae73@gmail.com.
authors.forename: Yong-Hee
authors.initials: YH
authors.lastname: Park
authors.forename: In-Kyung
authors.initials: IK
authors.lastname: Song
authors.forename: Jin-Tae
authors.initials: JT
authors.lastname: Kim
mesh_terms: D002248:Carbon Monoxide / Q000097:blood*; D005260:Female; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D008297:Male; D016343:Monitoring, Intraoperative / Q000379:methods*; D019635:Neurosurgical Procedures; D010092:Oximetry / Q000295:instrumentation*
chemical_list: D006454:Hemoglobins; D002248:Carbon Monoxide