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Endoscopic submucosal excavation treatment characteristics
| Group | Location (n) | Diameter (cm) | Operating time (min) | Success rate (%) | Full-thickness isolation (n) |
| CO2 | Esophagus (4) | 1.7 | 41 | 100 | 3 |
| Stomach (22) | 1.3 | 23 | |||
| Rectum (2) | 1.5 | 40 | |||
| Sigmoid colon (2) | 1.9 | 47 | |||
| Air | Esophagus (6) | 1.1 | 43 | 100 | 2 |
| Stomach (21) | 0.7 | 31 | |||
| Rectum (2) | 0.9 | 38 | |||
| Sigmoid colon (1) | 1.7 | 51 |
