TY  - RPRT
TI  - Instruments for causal inference: an epidemiologist's dream?
AU  - Miguel A Hernán
AU  - James M Robins
PY  - 2006
DO  - 10.1097/01.ede.0000222409.00878.37
UR  - https://pubmed.ncbi.nlm.nih.gov/16755261/
ID  - 16755261
ER  -