1. Department of Anesthesiology Osaka City University Graduate School of Medicine Osaka Japan
2. Department of Obstetrics and Gynecology Osaka City University Graduate School of Medicine Osaka Japan
3. Department of Cardiovascular Surgery Osaka City University Graduate School of Medicine Osaka Japan
4. Department of Cardiovascular Medicine Osaka City University Graduate School of Medicine Osaka Japan
5. Department of Diagnostic and Interventional Radiology Osaka City University Graduate School of Medicine Osaka Japan