@book{3087,
	author = {Symposium on Epidemiologic Studies and Clinical Trials in Chronic Diseases 1972 : Washington,D.C.},
	title = {Epidemilogic studies and clinical trials in chronic disease : procedings.},
	publisher = {Pan American Health Organization,},
	year = {1973.},
	series = {(PAHO scientific publication, no. 257).},
	address = {Washington : }
}