TY  - RPRT
TI  - Confounding and Simpson's paradox.
AU  - S A Julious
AU  - M A Mullee
PY  - 1994
DO  - 10.1136/bmj.309.6967.1480
UR  - https://pubmed.ncbi.nlm.nih.gov/7804052/
ID  - 7804052
ER  -