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: METHODS : Male pesticide applicators in Iowa and North Carolina reported lifetime diazinon use at enrolment ( 1993 - 1997 ) and follow - up ( 1998 - 2005 ) ; cancer incidence was assessed through 2010 ( North Carolina ) / 2011 ( Iowa ) .
### Output Text:
METHODS : Male pesticide applicators in Iowa and North Carolina reported lifetime <span class="chemical">diazinon</span> use at enrolment ( 1993 - 1997 ) and follow - up ( 1998 - 2005 ) ; cancer incidence was assessed through 2010 ( North Carolina ) / 2011 ( Iowa ) . 