1 Department of Surgical Oncology and General Surgery, The First Affiliated Hospital of China Medical University, 155 North Nanjing Street, Heping District, Shenyang City, 110001, China.
2 Division of Gastroenterology, Department of Medicine, Washington University School of Medicine, St Louis, MO, 63110, USA.
3 Department of Surgical Oncology and General Surgery, The First Affiliated Hospital of China Medical University, 155 North Nanjing Street, Heping District, Shenyang City, 110001, China. josieon826@sina.cn.