TY  - BOOK
AU  - Fletcher, R. W.
TI  - Clinical epidemiology: the essentials
SN  - 078177571
AV  - RA 652.2 .C55F58 
PY  - 2005///
CY  - Philadephia
PB  -  Lippincott Williams & Wilkins
KW  - Clinical Epidemiology
ER  -