RT Journal Article SR Electronic T1 John Snow, hero of cholera: RIP JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1736 OP 1736 DO 10.1503/cmaj.080805 VO 178 IS 13 A1 Koch, Tom YR 2008 UL http://www.cmaj.ca/content/178/13/1736.abstract