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Outcome classification for the control group
| Grades | Subgrades | Outcome |
|---|---|---|
| Healed | 1 | Suitable for split skin grafting, flap coverage or self‐healing |
| Unhealed | 3A | Minor amputation (below ankle) |
| 3B | Major amputation (above ankle) | |
| Others | 4 | Others (patient withdrawal, discontinuation, death, etc.) |
