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: Proteinuria increased from 0 . 445 ( 0 to 1 . 5 ) g / d before conversion to 3 . 2 g / dL ( 0 . 2 to 12 ) after conversion ( P = 0 . 001 ) .
### Output Text:
Proteinuria increased from 0 . 445 ( 0 to 1 . 5 ) g / d before conversion to 3 . 2 g / dL ( 0 . 2 to 12 ) after conversion ( P = 0 . 001 ) . 