1. Department of Diagnostic and Interventional Radiology, Graduate School of Medicine, Osaka City University, Abeno-ku, Osaka city, Osaka, Japan
2. Department of Gastroenterology, Naniwa Ikuno Hospital, Naniwa-ku, Osaka city, Osaka, Japan
3. Department of Hepatology, Osaka City General Hospital, Miyakojima Hon-Dori, Miyakojima-ku, Osaka city, Osaka, Japan