TY  - BOOK
AU  - Haynes, R Brian
AU  - Sackett, David L
AU  - Guyatt, Gordon H
AU  - Tugwell, Peter
TI  - Clinical epidemiology; how to do clinical practice research
SN  - 0781745241
PY  - 2006///
PB  - Lippincott Williams & Wilkins
ER  -