TY  - RPRT
TI  - GI Epidemiology: databases for epidemiological studies.
AU  - J A Davila
AU  - H B El-Serag
PY  - 2007
DO  - 10.1111/j.1365-2036.2006.03207.x
UR  - https://pubmed.ncbi.nlm.nih.gov/17229241/
ID  - 17229241
ER  -