title: Invited commentary: the testimony of Dr. Snow.
authors.affiliation: Department of Clinical Epidemiology, Leiden University Hospital Medical Centre, The Netherlands. vdbroucke@mail.medfac.leidenuniv.nl
authors.forename: J P
authors.initials: JP
authors.lastname: Vandenbroucke
mesh_terms: D018562:Disease Transmission, Infectious / Q000266:history; D004739:England; D004813:Epidemiology / Q000266:history* / Q000331:legislation & jurisprudence; D049672:History, 19th Century; D006801:Humans; D007221:Industry / Q000266:history / Q000331:legislation & jurisprudence; D010506:Periodicals as Topic / Q000266:history