1 The First Department of General Surgery, Hunan Provincial People's Hospital (The First Affiliated Hospital of Hunan Normal University), No. 61 Jiefang West Road, Changsha, Hunan, China. hxhuangxing@126.com.
2 Medical Department, The Third Xiangya Hospital, Changsha, Hunan, China.
3 The First Department of General Surgery, Hunan Provincial People's Hospital (The First Affiliated Hospital of Hunan Normal University), No. 61 Jiefang West Road, Changsha, Hunan, China. 191108120@qq.com.