RobertsHJInfluenzaLim WS. and pneumococcal vaccinations: an update. J R Coll Physicians Edinb 2007; 37:228–31.
2.
MelegaroAEdmundsWJ.The 23-valent pneumococcal polysaccharide vaccine. Part I. Efficacy of PPV in the elderly: a comparison of meta-analyses. Eur J Epidemiol 2004; 19:353–63.
3.
MangtaniPFCuttsHallAJ.Efficacy of polysaccharide pneumococcal vaccine in adults in more developed countries: the state of the evidence. Lancet Infect Dis 2003; 3:71–8.
4.
Conaty S The effectiveness of pneumococcal polysaccharide vaccines in adults: a systematic review of observational studies and comparison with results from randomised controlled trials. Vaccine 2004; 22(23–24):3214–24.
5.
ButlerJCRFBreimanCampbellJF Pneumococcal polysaccharide vaccine efficacy: an evaluation of current recommendations. JAMA 1993; 270:1826–31.