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