TY  - BOOK
AU  - Koepsell,Thomas D.
AU  - Weiss,Noel S.
TI  - Epidemiologic methods: studying the occurrence of illness 
SN  - 0195150783
PY  - 2003///
CY  - Oxford
PB  - Oxford University Press
KW  - Epidemiology
KW  - Methodology
KW  - Epidemiologic Methods
ER  -