1 Department of Gastrointestinal and Minimally Invasive Surgery, Shaoxing Second Hospital, Shaoxing, Zhejiang, China.
2 Department of Gastrointestinal and Minimally Invasive Surgery, Shaoxing Second Hospital, Shaoxing, Zhejiang, China; Department of Clinical Medicine, Shaoxing University School of Medicine, Zhejiang, China. Electronic address: bandian2015@126.com.