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: After eliminating spurious hypercalcemias or those associated with intravenous fluids , the authors identified 18 non - lithium - treated patients with hypercalcemias related to malignancies and other medical conditions ( group A ) and 12 patients with lithium - associated hypercalcemia ( group B ) .
### Output Text:
After eliminating spurious hypercalcemias or those associated with intravenous fluids , the authors identified 18 non - <span class="chemical">lithium</span> - treated patients with hypercalcemias related to malignancies and other medical conditions ( group A ) and 12 patients with <span class="chemical">lithium</span> - associated hypercalcemia ( group B ) . 