TY  - JOUR
TI  - The design versus the analysis of observational studies for causal effects: parallels with the design of randomized trials
AU  - Donald B. Rubin
JO  - Statistics in Medicine
PY  - 2006
VL  - 26
IS  - 1
DO  - 10.1002/sim.2739
UR  - https://doi.org/10.1002/sim.2739
ER  -