2.3. Randomization
Eligible patients (blinded) were randomized to one of the 2 groups in a 1:1 ratio using concealed allocation by a research personnel, with the randomization table being computer generated at the Center for Clinical Epidemiology and Evidence-Based Medicine of Naval Medical University, Shanghai, China. To ensure the integrity of the trial, the research personnel who generated the randomization table was not involved in the colonoscopic procedure. However, due to the nature of the intervention, both the colonoscopist and research personnel were aware of the trial group assignments after randomization.