RT Journal Article SR Electronic T1 The controversy over the efficacy of pneumococcal vaccine JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 18 OP 19 DO 10.1503/cmaj.081744 VO 180 IS 1 A1 Ross Andrews, PhD MPH A1 Sarah A. Moberley, BN MPH YR 2009 UL http://www.cmaj.ca/content/180/1/18.abstract