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: Hunt and Hess grade ( P < 0 . 005 ) and age ( P < 0 . 007 ) were significant predictors of outcome for the patients with cocaine - related aneurysms .
### Output Text:
Hunt and Hess grade ( P < 0 . 005 ) and age ( P < 0 . 007 ) were significant predictors of outcome for the patients with <span class="chemical">cocaine</span> - related aneurysms . 