TY  - BOOK
AU  - Fletcher, Robert H.
AU  - Fletcher, Robert H.
AU  - Fletcher, Suzanne W.
AU  - Wagner, Edward H.
TI  - Clinical epidemiology: the essentials
SN  - 0683032518
PY  - 1988///
CY  - Baltimore
PB  - Williams & Wilkins
KW  - Epidemiologic Methods
N1  - Includes bibliographical references and index
ER  -