1. Department of Endoscopy, Okayama University Hospital, Japan
2. Department of Internal Medicine, Hiroshima City Hospital, Japan.
3. University of Tennessee College of Medicine, Academic Gastroenterology, Program in Advanced Therapeutic and Interventional Endoscopy, Erlanger Hospital, Chattanooga, Tennessee, USA
4. Division of Research and Development for Minimally Invasive Treatment, Cancer Center, School of Medicine, Keio University, Tokyo, Japan
5. Department of Gastroenterology and Hepatology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan