(Q74242359)
Statements
Randomised trial of 23-valent pneumococcal capsular polysaccharide vaccine in prevention of pneumonia in middle-aged and elderly people. Swedish Pneumococcal Vaccination Study Group (English)
A Ortqvist
J Hedlund
L A Burman
E Elbel
M Höfer
M Leinonen
I Lindblad
B Sundelöf
1 February 1998