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: Aggressive behaviors have been reported in patients who suffer from some psychiatric disorders , and are common in methamphetamine ( METH ) abusers .
### Output Text:
Aggressive behaviors have been reported in patients who suffer from some psychiatric disorders , and are common in <span class="chemical">methamphetamine</span> ( <span class="chemical">METH</span> ) abusers . 