Inhaled glucocorticoids in COPD: immortal time bias.
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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
D000893:Anti-Inflammatory Agents; D005938:Glucocorticoids; D013256:Steroids