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| Group | Diameter of local redness and swelling (cm) | Subsiding time of local redness and swelling (hours) | Cases of local blister appearing | Local infection |
|---|---|---|---|---|
| 1 | 2.7 | 16.9 | 3 | None |
| 2 | 1.6 | 8.7 | None | None |
| 3 | 1.2 | 5.7 | None | None |
| 4 | 1.7 | 9.6 | None | None |
