1 The First Department of General Surgery, Department of Colorectal and Anal Surgery, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Hunan, Changsha, China. Electronic address: hxhuangxing@qq.com.
2 The First Department of General Surgery, Department of Colorectal and Anal Surgery, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Hunan, Changsha, China. Electronic address: 191108120@qq.com.