1. Department of Gastrointestinal Surgery and Hernia Center, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Guangzhou, China.
2. Department of Gastrointestinal Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, China.
3. Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, Guangzhou, China.