TY  - RPRT
TI  - Re: "Comparing Proportion Exposed in Case-Control Studies Using Several Control Groups".
AU  - S Greenland
AU  - W R Fairweather
PY  - 1990
DO  - 10.1093/oxfordjournals.aje.a115591
UR  - https://pubmed.ncbi.nlm.nih.gov/2321638/
ID  - 2321638
ER  -