TY - JOUR T1 - Meningococcal disease: was Ottawa's mass-vaccination program necessary? JF - Canadian Medical Association Journal JO - CMAJ SP - 1033 LP - 1033 VL - 146 IS - 6 AU - C. Gray Y1 - 1992/03/15 UR - http://www.cmaj.ca/content/146/6/1033.abstract ER -