TY  - GEN
AU  - Gordis Leon
TI  - Epidemiology 
SN  - 0721603262
U1  - 614.4 21
PY  - 2004///
CY  - Philadelphia, Pa.
PB  - Saunders
KW  - Epidemiology
KW  - Epidemiologic Methods
N1  - Includes bibliographical references and index
ER  -