TY  - BOOK
AU  - Cummings,Steven R.
AU  - Browner,Waren S.
TI  - Designing clinical research: an epidemiologic approach 
SN  - 0683042491
PY  - 1998///
CY  - Baltimore
PB  - Williams & Wilkins
KW  - Epidemiologic Methods
KW  - Research design
N1  - Includes bibliographies and index
ER  -