TY  - BOOK
AU  - Hulley, Stephen B
TI  - Designing clinical research. (4th ed.)
SN  - 9781608318049
AV  - R 853.C55 Des 
PY  - 2013///
CY  - Philadephia
PB  - Lippincolt Williams and Wilkins
KW  - EPIDEMIOLOGIC METHODS
KW  - RESEARCH DESIGN
N1  - includes bibliographical references and index
ER  -