TY  - BOOK
AU  - Elwood,J.Mark
AU  - Elwood,J.Mark
TI  - Critical appraisal of epidemiological studies and clinical trials 
SN  - 0192627449
AV  - RA652.4 E9
PY  - 1998///
CY  - Oxford 
PB  - New York
KW  - Epidemiology
KW  - Clinical trials
KW  - Diseases
KW  - Epidemiologic Methods
ER  -