論文（英文）
How to use marginal structural models in randomized trials to estimate the natural direct and indirect effects of therapies mediated by causal intermediates.
Oba K, Sato T, Ogihara T, Saruta T, Nakao K. How to use marginal structural models in randomized trials to estimate the natural direct and indirect effects of therapies mediated by causal intermediates. Clin Trials 2011; 8: 277-87.