TY  - BOOK
AU  - Kelsey,Jennifer L.
AU  - Thompson,W.Douglas
AU  - Evans,Alfred S.
TI  - Methods in observational epidemiology 
SN  - 0195036573 
AV  - RA652.4 K45 
PY  - 1986///
CY  - New York 
PB  - Oxford University Press
KW  - Epidemiology
KW  - Epidemiologic Methods
ER  -