In the sentence extracted from biomedical literature, identify all the disease entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="disease"> to denote a disease.

### Input Text: The most common phenotype of ALD is the cerebral form ( 45 % ) that develops in boys between 5 - 12 yr .
### Output Text:
The most common phenotype of <span class="disease">ALD</span> is the cerebral form ( 45 % ) that develops in boys between 5 - 12 yr . 