1. Department of General Surgery, Quzhou Kecheng People's Hospital, Quzhou, Zhejiang 324000, P.R. China
2. Department of General Surgery, Yancheng Dafeng Hospital of Traditional Chinese Medicine, Yancheng, Jiangsu 224110, P.R. China
3. Department of Radiology, Wuxi Xinwu Hospital of Traditional Chinese Medicine, Wuxi, Jiangsu 214000, P.R. China
4. Department of Radiology, Maternal and Child Health Hospital of Huaiyin District, Huai'an, Jiangsu 223300, P.R. China