1 Department of Colorectal Surgery, First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang, 311200, China.
2 Department of General Surgery, Zigong First People's Hospital, Sichuan, 643000, China.
3 Department of Colorectal Surgery, First People's Hospital of Xiaoshan District, Hangzhou, Zhejiang, 311200, China. Electronic address: vitc361@163.com.