TY  - GEN
AU  - Fletcher, Robert H.
AU  - Fletcher, Suzanne W.
TI  - Clinical epidemiology: the essential
SN  - 9780781752152
PY  - 2005///
CY  - Philadelphia
PB  - :ippincott Williams & Wilkins
KW  - Clinical epidemiology
KW  - Epidemiologic Methods
ER  -