TY  - BOOK
AU  - Silman,Alan J.
AU  - Macfarlane,Gary J.
TI  - Epidemiological studies: a practical guide 
SN  - 0521009391
U1  - 614.4 
PY  - 2002///
CY  - Cambridge, New York
PB  - Cambridge University Press
KW  - Epidemiology
KW  - Επιδημιολογία
N1  - Ευρετήριο: σ. 237-241
UR  - http://www.loc.gov/catdir/description/cam022/2001043361.html
UR  - http://www.loc.gov/catdir/toc/cam026/2001043361.html
UR  - http://www.loc.gov/catdir/enhancements/fy0731/2001043361-b.html
ER  -