TY  - BOOK
AU  - Webb,Penny
AU  - Bain, Chris.
TI  - Essential epidemiology: an Introduction for students and health professionals 
SN  - 9780521177313 (pbk.)
PY  - 2011///
CY  - New York
PB  - Cambridge Press University
KW  - Epidedemiologic Methods
N1  - lncludes bibliographical references; lncludes index
ER  -