学会発表（国際）
Estimation of the average causal effect among subgroups defined by post-treatment variables.
Morita S and Matsuyama Y. Estimation of the average causal effect among subgroups defined by posttreatment variables. The 25th annual Conference of the International Society for Clinical Biostatistics (ISCB). 15- 19, August, 2004, Leiden, The Netherlands. Cont. 2003: 24(3S), 56S.