TY  - JOUR
A1  - Rosenbaum, P.
A1  - Rubin, D.
T1  - The central role of the propensity score in observational studies for causal effects
Y1  - 1983
DO  - 10.1093/biomet/70.1.41
JF  - Biometrika
VL  - 70
IS  - 1
SP  - 41
EP  - -55

ER  -