RT Journal Article SR Electronic T1 NACI update on pertussis vaccination in pregnancy JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 521 OP 521 VO 60 IS 6 A1 Bryna Warshawsky YR 2014 UL http://www.cfp.ca/content/60/6/521.1.abstract AB