<qa>  What was the entry criteria for the retrospective part of the gastroscopy patients?GROUP The control group five young endoscopist not accepted the TTT The experimental group five young endoscopist accepted the TTT CRITERIA The entry criteria A retrospective part 1 The gastroscopy patients was operated by the ten doctors in 2014: 2 painless gastroscopyintravenous anesthesia; 3 age: 18-70 years old; male or female B: prospective part 