Study characteristics
Table 1 shows the demographic characteristics and clinical data of all
22 studies12–33. Regarding their design, these 22
studies included ten randomized controlled trials, six prospective
comparative studies, five retrospective comparative studies and one
retrospective cohort study. The enrolled studies were published between
2008 and 2019. The total number of interventions was 1578 interventions;
with 766 interventions in the endoscopic group, and 812 in the
microscopic group.