TY  - BOOK
AU  - _Alice S Whittemore 
TI  - _Methods in observation epidemiology .-2nd ed. Jennifer L.Kelsey 
SN  - 195083776
AV  - RA652.4 .K45 1996  
CY  - New York Oxford 1996 
KW  - _Epidemiolgy
N1  - Includes index.; Includes index.
ER  -