Postcard reminders and influenza vaccination.
Barnas
G P
GP
McKinney
W P
WP
D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007251:Influenza, Human / Q000517:prevention & control*; D008297:Male; D011177:Postal Service; D014611:Vaccination