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Overall chronic graft-versus-host disease grade according to the National Institutes of Health
| Mild chronic GVHD |
| 1 or 2 organs involved, with a score of no more than 1 PLUS |
| Lung score 0 |
| Moderate chronic GVHD |
| 3 or more organs involved, with a score of no more than 1 |
| OR |
| Lung score 1 |
| Severe chronic GVHD |
| At least 1 organ with a score of 3 |
| OR |
| Lung score of 2 or 3 |
GVHD graft-versus-host disease
Adapted from Jagasia et al. [15]
