TY  - JOUR
TI  - The central role of the propensity score in observational studies for causal effects
AU  - Paul R. Rosenbaum
AU  - Donald B. Rubin
JO  - Biometrika
PY  - 1983
VL  - 70
IS  - 1
DO  - 10.1093/biomet/70.1.41
UR  - https://doi.org/10.1093/biomet/70.1.41
ER  -