TY  - RPRT
TI  - Fallibility in estimating direct effects.
AU  - Stephen R Cole
AU  - Miguel A Hernán
PY  - 2002
DO  - 10.1093/ije/31.1.163
UR  - https://pubmed.ncbi.nlm.nih.gov/11914314/
ID  - 11914314
ER  -