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: We used time - to - event analysis to identify potential predictors of decrease in renal function including age , baseline ejection fraction , baseline creatinine , low systolic blood pressure ( < 100 mm Hg ) , history of hypertension , diabetes , and use of antiplatelet , diuretic , and beta - blocker therapy .
### Output Text:
We used time - to - event analysis to identify potential predictors of decrease in renal function including age , baseline ejection fraction , baseline <span class="chemical">creatinine</span> , low systolic blood pressure ( < 100 mm Hg ) , history of hypertension , diabetes , and use of antiplatelet , <span class="chemical">diuretic</span> , and beta - blocker therapy . 