Observational studies of inhaled corticosteroids in chronic obstructive pulmonary disease: misconstrued immortal time bias.
Suissa
Samy
S
D000280:Administration, Inhalation; D015982:Bias; D016022:Case-Control Studies; D005938:Glucocorticoids / Q000008:administration & dosage*; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy* / Q000401:mortality; D015996:Survival Rate; D013997:Time Factors
D005938:Glucocorticoids