1. Division of Gastroenterology, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
2. NTT Media Intelligence Laboratories, NTT Corporation, Yokosuka, Japan
3. Steinberg-Bernstein Centre for Minimally Invasive Surgery and Innovation, McGill University Health Centre, Montreal, Quebec, Canada
4. Center for Clinical Research and Advanced Medicine Establishment Shiga University of Medical Science, Shiga, Japan