TY  - BOOK
AU  - Elwood,J.Mark
TI  - Critical appraisal of epidemiological studies and clinical trials
SN  - 0198529554
PY  - 2007///
CY  - Oxford
PB  - Oxford University Press
KW  - Epidemiologic Methods
KW  - Epidemiologic Studies
KW  - Clinical trials
ER  -