TY - JOUR T1 - Canada needs a national immunization program: an open letter to the Honourable Anne McLellan, federal minister of health JF - Canadian Medical Association Journal JO - CMAJ SP - 567 LP - 568 VL - 168 IS - 5 AU - Monika Naus AU - David W. Scheifele Y1 - 2003/03/04 UR - http://www.cmaj.ca/content/168/5/567.abstract ER -