| 0 | No stage 1–4 of any organ |
| 1 | Stage 1–2 skin rash and no liver or GI involvement |
| 2 | Stage 3 skin rash, or Stage 1 liver involvement, or Stage 1 GI involvement |
| 3 | Stage 0–3 skin rash, with Stage 2-3 liver involvement, and/or Stage 2–3 GI involvement |
| 4 | Stage 4 skin rash, liver, and/or GI involvement |
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