TY  - BOOK
AU  - Hulley, Stephen B.
TI  - Designing clinical research: an epidemiologic approach 
SN  - 0781722187
PY  - 2001///
CY  - Philadelphia
PB  - Lippincott Williams & Wilkins
KW  - Epidemiologic Methods
KW  - Research Design
N1  - Includes bibliographical references and index
ER  -