TY - JOUR T1 - US hospitals balking at smallpox vaccination JF - Canadian Medical Association Journal JO - CMAJ SP - 1034 LP - 1034-a VL - 168 IS - 8 AU - Barbara Sibbald Y1 - 2003/04/15 UR - http://www.cmaj.ca/content/168/8/1034.2.abstract ER -