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: Patients with the diagnosis of methamphetamine based on DSM - IV were interviewed using the Mini International Neuropsychiatric Interview ( M . I . N . I . ) for methamphetamine - induced psychosis and other Axis I psychiatric disorders .
### Output Text:
Patients with the diagnosis of <span class="chemical">methamphetamine</span> based on DSM - IV were interviewed using the Mini International Neuropsychiatric Interview ( M . I . N . I . ) for <span class="chemical">methamphetamine</span> - induced psychosis and other Axis I psychiatric disorders . 