References
- Ast , D. and Schlesinger , E. 1956 . The conclusion of a ten-year study of water fluoridation . American Journal of Public Health , 46 : 265 – 271 .
- Centers for Disease Control. 1980 . Annual summary 1980: Reported morbidity and mortality in the United States . Morbidity and Mortality Weekly Report , 1977 (26) : 293
- Dawber , T. , Kannel , W. and Lyell , L. 1963 . An approach to longitudinal studies in the community: The Framingham Study . Annals of the New York Academy of Sciences , 107 : 593 – 599 .
- Fraser , D. 1987 . Epidemiology as a liberal art . New England Journal of Medicine , 316 ( 6 ) : 309 – 314 .