TY  - BOOK
AU  - Norell,Staffan E.
TI  - A short course in epidemiology
SN  - 0881678422
PY  - 1992///
CY  - New York
PB  - Raven Press
KW  - Case
KW  - Control studies
KW  - Cohort studies
KW  - Research design
ER  -