title: Benefits of influenza vaccine in US elderly--appreciating issues of confounding bias and precision.
authors.forename: Eelko
authors.initials: E
authors.lastname: Hak
authors.forename: Arno W
authors.initials: AW
authors.lastname: Hoes
authors.forename: Jim
authors.initials: J
authors.lastname: Nordin
authors.forename: Kristin L
authors.initials: KL
authors.lastname: Nichol
mesh_terms: D000368:Aged; D015982:Bias; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000401:mortality*; D016896:Treatment Outcome
chemical_list: D007252:Influenza Vaccines