TY  - BOOK
AU  - Fletcher Robert H
AU  -  Fletcher Suzanne W
AU  -  Wagner Edward H
TI  - Clinical epidemiology-the essentials
U1  - L:4:51, M2 
PY  - 1982///
CY  - Baltimore
PB  - Williams and ilkins       
KW  -  Disease
KW  - Medicine
ER  -