title: Different methods are mixed up in the meta-analysis.
authors.affiliation: Hyogo Prefectural Amagasaki Hospital, Amagasaki, Hyogo, Japan. Electronic address: hira_to_ber3598@yahoo.co.jp.
authors.forename: Hiraku
authors.initials: H
authors.lastname: Tsujimoto
authors.affiliation: Department of Respiratory Medicine, Hyogo Prefectural Amagasaki Hospital, Hyogo, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Kataoka
mesh_terms: D006801:Humans; D007442:Intubation, Intratracheal / Q000379:methods*; D008168:Lung / Q000000981:diagnostic imaging*; D014132:Trachea / Q000000981:diagnostic imaging*; D018084:Ultrasonography, Interventional