1. Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health Kyoto University Kyoto Japan
2. Department of Anesthesiology and Intensive Care Medicine, Graduate School of Medical Sciences Nagoya City University Nagoya Japan
3. Department of Clinical Epidemiology, Graduate School of Biomedical Sciences Nagasaki University Nagasaki Japan
4. Department of Anesthesia Kyoto University Hospital Kyoto Japan