TY - JOUR T1 - A tale of 2 epidemics: link discovered between smallpox and HIV resistance JF - Canadian Medical Association Journal JO - CMAJ SP - 406 LP - 406 VL - 162 IS - 3 AU - David Helwig Y1 - 2000/02/08 UR - http://www.cmaj.ca/content/162/3/406.1.abstract ER -