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: A statistically significant relationship was found in the activity of G6PD between erythrocytes and muscle of the male subjects ( r = 0 . 968 ; p = 0 . 00008 ) .
### Output Text:
A statistically significant relationship was found in the activity of G6PD between erythrocytes and muscle of the male subjects ( r = 0 . 968 ; p = 0 . 00008 ) . 