PT - JOURNAL ARTICLE ED - , TI - Periodic health examination, 1991 update: 2. Administration of pneumococcal vaccine. Canadian Task Force on the Periodic Health Examination DP - 1991 Mar 15 TA - Canadian Medical Association Journal PG - 665--671 VI - 144 IP - 6 4099 - http://www.cmaj.ca/content/144/6/665.short 4100 - http://www.cmaj.ca/content/144/6/665.full SO - CMAJ1991 Mar 15; 144