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

### Input Text: AKI occurred significantly more often in LAG with 36 % versus 21 % in HAG ( P = 0 . 035 ) .
### Output Text:
AKI occurred significantly more often in LAG with 36 % versus 21 % in HAG ( P = 0 . 035 ) . 