1 The Second Affiliated Hospital of Kunming Medical University, 374 Dianmian avenue, Kunming City, Yunnan Province, China. Electronic address: SunFeng1971@163.com.
2 Department of Gastrointestinal Surgery, The Second Affiliated Hospital of Kunming Medical University, China.
3 Department of Radiology, The Second Affiliated Hospital of Kunming Medical University, China.