1. Department of Gastroenterology; The Sixth Affiliated Hospital of Sun Yat-sen University; Guangzhou Guangdong Province China
2. Department of Radiology; The Sixth Affiliated Hospital of Sun Yat-sen University; Guangzhou Guangdong Province China
3. Department of Gastroenterology; Nanhai Hospital of Southern Medical University; Foshan Guangdong Province China
4. Zhongshan World Medical Instruments Co., Ltd.; Zhongshan Guangdong Province China