Table 1. Pre-procedure histological grading.
| Histological grading | % (number of patients) |
| B1 | 4.9% (6 patients) |
| B2 | 6.5% (8 patients) |
| B3 | 81.1% (99 patients) |
| B4 | 0.8% (1 patient) |
| B5a, B5b | 2.4% (3 patients), 4% (5 patients) |
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