What you can do to improve adult immunization rates 

• Fam Pract. 2015 October;64(10):625-626,628-630,633.

Estimating the Burden of Pneumococcal Pneumonia among Adults: A Systematic Review and Meta-Analysis of Diagnostic Techniques

• Published: April 2, 2013 – DOI: 10.1371/journal.pone.0060273