TY  - RPRT
TI  - Confounding: essence and detection.
AU  - O S Miettinen
AU  - E F Cook
PY  - 1981
DO  - 10.1093/oxfordjournals.aje.a113225
UR  - https://pubmed.ncbi.nlm.nih.gov/7304589/
ID  - 7304589
ER  -