PT - JOURNAL ARTICLE AU - P. J. Feher TI - Pertussis vaccine: why do some parents say no? DP - 1989 Mar 01 TA - Canadian Medical Association Journal PG - 498c--498 VI - 140 IP - 5 4099 - http://www.cmaj.ca/content/140/5/498c.short 4100 - http://www.cmaj.ca/content/140/5/498c.full SO - CMAJ1989 Mar 01; 140