465
Participants
Start Date
October 31, 2007
Primary Completion Date
December 31, 2010
Study Completion Date
February 28, 2011
Team 1
experienced endoscopist with a experienced assistant
Team 2
same experienced endoscopist with a new trained assistant
The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou
Qi-yong Li
OTHER