TY  - BOOK
AU  - MacMahon, Brian.
AU  - Pugh, Thomas F.
ED  - 
ED  - 
ED  - 
ED  - 
TI  - : principles and methods
SN  - 700001972
SN  - 2
PY  - 1970///46
CY  - Boston
PB  - Little, Brown
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Epidemiology.;Epidemiology
N1  - Bibliography: p. 333-361; 5
ER  -