1. Department of Gastroenterology and Hepatology Osaka University Graduate School of Medicine Suita Osaka Japan
2. Osaka International Cancer Institute Osaka Osaka Japan
3. Osaka Rosai Hospital Sakai Osaka Japan
4. Kansai Rosai Hospital Amagasaki Hyogo Japan
5. Osaka Police Hospital Osaka Osaka Japan
6. Ikeda Municipal Hospital, Ikeda Osaka Japan