| Number at Risk | ||||||
| Months | 1 | 3 | 6 | 12 | 18 | 24 |
| PBMNC group | 9 | 25 | 31 | 32 | 33 | 33 |
| Control group | 0 | 0 | 0 | 1 | 1 | 1 |
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