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Effectiveness of heptavalent pneumococcal conjugate vaccine in children younger than five years of age for prevention of pneumonia
S.B. Black, H.R. Shinefield, S. Ling, J. Hansen, B. Fireman, D. Spring, J. Noyes, E. Lewis, P. Ray, J. Lee, J. Hackell
The Pediatric Infectious Disease Journal, 2002; 21: 810-815