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 studied a previously described Swiss family with inherited C9 deficiency .
### Output Text:
We studied a previously described Swiss family with <span class="disease">inherited C9 deficiency</span> . 