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Stages according to the METAVIR criteria (Bedossa et al)
| Stage 0 | No fibrosis |
| Stage 1 | Mild fibrosis (portal/periportal fibrosis, no septa) |
| Stage 2 | Moderate fibrosis (few septa) |
| Stage 3 | Severe fibrosis (many septa, no cirrosis) |
| Stage 4 | Cirrhosis |
