Before revision: Doctor John SnowBlames Water Pollution for Cholera Epidemic, by David Vachon UCLA Department of Epidemiology, School of Public Health May June 2005John Snow, Father of Epidemiology NPR Talk of the Nation.
After revision: Doctor John SnowBlames Water Pollution for Cholera Epidemic, by David Vachon UCLA Department of Epidemiology, School of Public Health May "John Snow, Father of Epidemiology ", NPR, Talk of the Nation.