1. Endoscopy Division; National Cancer Center Hospital; Tokyo Japan
2. Gastroenterology and Hepatology Unit; University of Malaya; Kuala Lumpur Malaysia
3. Department of Gastroenterology; Changi General Hospital; Singapore
4. Department of Gastroenterology; Aichi Cancer Center Hospital; Aichi Japan
5. Department of Endoscopy; The Jikei University School of Medicine; Tokyo Japan