TY  - BOOK
AU  - Sobel Eugene
TI  - Confidence limits, based on prospective studies, risk ratios and etilogic fractions standardized for confounding variables: equations and examples
U1  - 000SA.092 
PY  - 1976///
CY  - Chapel Hill
PB  - North Carolina Univ
KW  - Conidence limita
KW  - Etiologic fractions
ER  -