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: We conducted an association study of IDDM in a large number of Japanese subjects with multiple polymorphisms in INS region .
### Output Text:
We conducted an association study of <span class="disease">IDDM</span> in a large number of Japanese subjects with multiple polymorphisms in INS region . 