TY  - BOOK
AU  - Silman,Alan J.
AU  - Macfarlane,Gary J.
TI  - Epidemiological studies: a practical guide 
SN  - 0521810973
PY  - 2002///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Epidemiologic Methods
N1  - Includes index
ER  -