TY - JOUR T1 - Efficacy of pneumococcal polysaccharide vaccine JF - Canadian Medical Association Journal JO - CMAJ SP - 1135 LP - 1135 DO - 10.1503/cmaj.1090019 VL - 180 IS - 11 AU - Ross M. Andrews AU - Sarah A. Moberley Y1 - 2009/05/26 UR - http://www.cmaj.ca/content/180/11/1135.1.abstract ER -