TY  - JOUR 
T1  - Comparison of four extraction methods to detect hepatitis A virus RNA in serum and stool samples
JO  - Brazilian Journal of Infectious Diseases
A1  - Paula, Vanessa Salete de
A1  - Villar, Livia Melo
A1  - Gaspar, Ana Maria Coimbra
SN  - 1413-8670
UL  - 10.1590/S1413-86702003000200007
VL  - 7 
Y1  - 2003
PB  - Brasil 
ER  -