title: Sensitivity analysis, not a calculation of sensitivity, is essential in a propensity score analysis.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Hamada
authors.forename: Yousuke
authors.initials: Y
authors.lastname: Nakai
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Isayama
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Koike
mesh_terms: D001803:Blood Transfusion; D005260:Female; D005751:Gastric Lavage; D006471:Gastrointestinal Hemorrhage / Q000401:mortality*; D006801:Humans; D007902:Length of Stay; D008297:Male