1. Department of Hepatobiliary Surgery, The Sixth Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510655, P.R. China
2. Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510655, P.R. China
3. Department of Anesthesiology, The Sixth Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510655, P.R. China
4. Department of Pharmacy, The Sixth Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510655, P.R. China
5. Department of Endoscopy Center, The Sixth Affiliated Hospital, Sun Yat‑Sen University, Guangzhou, Guangdong 510655, P.R. China