TY  - BOOK
AU  - Yarnell,John
TI  - Epidemiology and prevention: a systems-based approach 
T2  - Oxford core texts
PY  - 2013///
CY  - Oxford, New York
PB  - Oxford University Press
KW  - Epidemiology
KW  - Epidemiologic Methods
N1  - Includes bibliographical references and index
ER  -