1. Insign Medical Technology (Hong Kong) Ltd., Room 635, 6/F, Building 17W, No. 17 Science Park West Avenue Hong Kong Science Park, Pak Shek Kok, N.T., Hong Kong
2. Department of Computing Science, New Jersey Institute of Technology, Newark 07102, NJ, USA
3. Department of Computer Science and Information Engineering, Asia University, Taichung 413, Taiwan
4. Department of Colorectal Surgery and Gastrointestinal Endoscopy Center, The First Affiliated Hospital of Naval Medical University, (Changhai Hospital), Shanghai, P. R. China
5. Department of Gastroenterology, The Chenggong Hospital Affiliated to Xiamen University, (Army 73rd Group Military Hospital), Xiamen, Fujian, P. R. China