Yue Qin1, Wenqi Zhong2, Yi Ma3, Lei Wang2, Chunyan Peng4. 1. Department of Gastroenterology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School; Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University. 2. Department of Gastroenterology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School. 3. Department of Radiology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School. 4. Department of Gastroenterology, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School. Electronic address: 1052283061@qq.com.