TY  - RPRT
TI  - The case-control study: valid selection of subjects.
AU  - A R Feinstein
PY  - 1985
DO  - 10.1016/0021-9681(85)90041-4
UR  - https://pubmed.ncbi.nlm.nih.gov/4008597/
ID  - 4008597
ER  -