1. Department of Gastroenterological Surgery; Kansai Rosai Hospital; Amagasaki Hyogo Japan
2. Osaka Medical Center for Cancer and Cardiovascular Diseases; Osaka Japan
3. NTT West Osaka Hospital; Osaka Japan
4. Toyonaka Municipal Hospital; Toyonaka Osaka Japan
5. Sakai Municipal Hospital; Sakai Osaka Japan
6. Suita Municipal Hospital; Suita Osaka Japan
7. Itami Municipal Hospital; Itami Hyogo Japan
8. Kinki Chuo Hospital; Itami Hyogo Japan
9. Graduate School of Medicine; Osaka University; Suita Osaka Japan