1. Department of PharmacoepidemiologyGraduate School of Medicine and Public Health, Kyoto University Kyoto Japan
2. Eisai Co., Ltd. Tokyo Japan
3. Center for the Promotion of Interdisciplinary Education and ResearchKyoto University Kyoto Japan
4. Biostatistics Section, Clinical Research CenterChiba University Hospital Chiba Japan
5. Department of Medical StatisticsShiga University of Medical Science Shiga Japan
6. Liver CenterSaga University Hospital Saga Japan