1 Departement of Gastrointestinal Surgery, the Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, 221002, People's Republic of China.
2 Departement of Gastrointestinal Surgery, the Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, 221002, People's Republic of China. zhuxccf@163.com.
3 Departement of Gastrointestinal Surgery, the Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu, 221002, People's Republic of China. shaoyutong1975@163.com.