TY  - BOOK
AU  - Merrill, Ray M
TI  - Introduction to epidemiology 
SN  - 9781284171105
U1  - 614.4 23rd ed.
PY  - 2021///
CY  - Burlington 
PB  - Jones & Bartlett Learning 
KW  - EPIDEMIOLOGIC METHODS; EPIDEMIOLOGY
ER  -