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Reasons for altered numbers of cases at different stages
| Group | 3 days after | 6 months after | 1 year after | |
|---|---|---|---|---|
| MSG | Death | 0 | 1 | 4 |
| Failure of normal follow-up | 0 | 1 | 0 | |
| Failure of catheterization | 1 | / | / | |
| Failure of statistical time | 0 | 2 | / | |
| Statistical cases | 31 | 27 | 23 | |
| OPSG | Death | 0 | 2 | 3 |
| Failure of normal follow-up | 0 | 3 | 1 | |
| Failure of catheterization | 2 | 1 | 1 | |
| Statistical cases | 42 | 36 | 28 | |
