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Location of lesions
| LG group (%) | HG group (%) | Total (%) | |
| Lower 1/3 | 7 (35.0) | 19 (51.4) | 26 (45.6) |
| Middle 1/3 | 8 (40.0) | 10 (27.0) | 18 (31.6) |
| Upper 1/3 | 3 (15.0) | 5 (13.5) | 8 (14.0) |
| Lower + middle | 2 (10.0) | 2 (5.4) | 4 (7.0) |
| Lower + upper | 0 (0.0) | 1 (2.7) | 1 (1.8) |
| Total | 20 (100) | 37 (100) | 57 (100) |
