TY  - GEN
AU  - Koepsell, Thomas D.
AU  - Weiss, Noel S.
TI  - Epidemiologic methods: studying the occurrence of illness
SN  - 9780195150780
U1  - 614.4 
PY  - 2003///
CY  - Oxford
PB  - Oxford university press
KW  - Epidemiology
KW  - Epidemiological methods
ER  -