1 Department of Oncology, Weifang People's Hospital, The First Affiliated Hospital of Weifang Medical University, Weifang, Shandong, China.
2 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, The 1st street of Jianshe East Road, Zhengzhou, 450000, Henan, China.
3 Department of Emergency Surgery, Cagliari University Hospital "D. Casula", Azienda Ospedaliero-Universitaria Di Cagliari, Cagliari, Italy.
4 Department of Oncology, Weifang People's Hospital, The First Affiliated Hospital of Weifang Medical University, Weifang, Shandong, China. fccliubr@zzu.edu.cn.
5 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, The 1st street of Jianshe East Road, Zhengzhou, 450000, Henan, China. fccliubr@zzu.edu.cn.