TY  - BOOK
AU  - Merrill,R M
TI  - Introduction to epidemiology / 
SN  - 9780763766221
PY  - 2009///
CY  - Sudbury, Mass. ; ,  London : 
PB  -  Jones and Bartlett, 
KW  - Epidemiology
KW  - Epidemiologic methods
ER  -