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: Pulmonary infections were less common in cyclosporine - treated renal patients than in Aza - treated patients ( P less than 0 . 05 ) .
### Output Text:
Pulmonary infections were less common in <span class="chemical">cyclosporine</span> - treated renal patients than in <span class="chemical">Aza</span> - treated patients ( P less than 0 . 05 ) . 