250
Participants
Start Date
August 1, 2022
Primary Completion Date
July 31, 2024
Study Completion Date
July 31, 2027
left-opening single-flap technique
left-opening single-flap technique
double-flap group technique
double-flap group technique
Tang-Du Hospital
OTHER
First Affiliated Hospital Xi'an Jiaotong University
OTHER
General Hospital of Ningxia Medical University
OTHER
Henan Provincial People's Hospital
OTHER
The First Affiliated Hospital of Shanxi Medical University
OTHER
Oncogastroenterology Committee of Chinese
OTHER