| Number at Risk | ||||||
| Months | 1 | 3 | 6 | 12 | 18 | 24 |
| PBMNC group | 37 | 34 | 33 | 32 | 30 | 30 |
| Control group | 37 | 33 | 27 | 16 | 11 | 8 |
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