title: Inhaled glucocorticoids in COPD: immortal time bias.
authors.forename: Don D
authors.initials: DD
authors.lastname: Sin
authors.forename: S F Paul
authors.initials: SF
authors.lastname: Man
authors.forename: Jack V
authors.initials: JV
authors.lastname: Tu
mesh_terms: D000280:Administration, Inhalation; D000893:Anti-Inflammatory Agents / Q000008:administration & dosage*; D015982:Bias; D003627:Data Interpretation, Statistical; D019317:Evidence-Based Medicine; D005938:Glucocorticoids / Q000008:administration & dosage*; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy*; D012107:Research Design / Q000592:standards*; D013256:Steroids; D013997:Time Factors
chemical_list: D000893:Anti-Inflammatory Agents; D005938:Glucocorticoids; D013256:Steroids