TY  - RPRT
TI  - Assessing cause and effect from trials: a cautionary note.
AU  - D Howel
AU  - R Bhopal
PY  - 1994
DO  - 10.1016/0197-2456(94)90030-2
UR  - https://pubmed.ncbi.nlm.nih.gov/8001354/
ID  - 8001354
ER  -