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: This is in accordance with molecular findings in other patients with Kniest dysplasia and confirms , in the original patient , that the disorder is caused by small inframe deletions often due to exon skipping as a result of COL2A1 splice site mutations . .
### Output Text:
This is in accordance with molecular findings in other patients with <span class="disease">Kniest dysplasia</span> and confirms , in the original patient , that the disorder is caused by small inframe deletions often due to exon skipping as a result of COL2A1 splice site mutations . . 