1. Division of Endoscopy and Ultrasonography, Department of Clinical Pathology and Laboratory Medicine, Kawasaki Medical School, Okayama, Japan
2. Department of Mechanical and Control Engineering, Graduate School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
3. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Osaka, Japan
4. Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan
5. Department of General Internal Medicine 2, Kawasaki Medical School, Okayama, Japan