title: Immortal time bias in the study of effectiveness of interferon-beta in multiple sclerosis.
authors.forename: Christel
authors.initials: C
authors.lastname: Renoux
authors.forename: Samy
authors.initials: S
authors.lastname: Suissa
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards; D015331:Cohort Studies; D003627:Data Interpretation, Statistical; D018450:Disease Progression; D005500:Follow-Up Studies; D006801:Humans; D016899:Interferon-beta / Q000008:administration & dosage* / Q000009:adverse effects; D009103:Multiple Sclerosis / Q000188:drug therapy* / Q000276:immunology / Q000401:mortality; D018579:Patient Selection; D015983:Selection Bias; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D016899:Interferon-beta