1 Department of Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, China; Shandong Provincial Clinical Research Center for Digestive Disease, Jinan, Shandong, China; Laboratory of Translational Gastroenterology, Qilu Hospital of Shandong University, Jinan, Shandong, China; Robot Engineering Laboratory for Precise Diagnosis and Therapy of GI Tumor, Qilu Hospital of Shandong University, Jinan, Shandong, China.