title: [Influenza vaccination in the elderly makes sense. Many confounding factors in observational research].
authors.affiliation: Erasmus Medisch Centrum, afd. Virologie, Nationaal Influenza Centrum, Rotterdam, The Netherlands. jong7662@planet.nl
authors.forename: Jan C
authors.initials: JC
authors.lastname: de Jong
authors.forename: Eelko
authors.initials: E
authors.lastname: Hak
authors.forename: A D M E Ab
authors.initials: AD
authors.lastname: Osterhaus
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000401:mortality* / Q000517:prevention & control*; D008297:Male; D009426:Netherlands
chemical_list: D007252:Influenza Vaccines