22.01.2007
opracowano na podstawie: Effectiveness of heptavalent pneumococcal conjugate vaccine in children younger than 5 years of age for prevention of pneumonia. Updated analysis using world health organization standardized interpretation of chest radiographs
J. Hansen, S. Black, H. Shinefield, T. Cherian, J. Benson, B. Fireman, E. Lewis, P. Ray, J. Lee
The Pediatric Infectious Disease Journal, 2006; 25: 779–781