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: Methamphetamine ( METH ) triggers a disruption of the monoaminergic system and METH abuse leads to negative emotional states including depressive symptoms during drug withdrawal .
### Output Text:
<span class="chemical">Methamphetamine</span> ( <span class="chemical">METH</span> ) triggers a disruption of the monoaminergic system and <span class="chemical">METH</span> abuse leads to negative emotional states including depressive symptoms during drug withdrawal . 