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: Furthermore , 18 . 28 % of patients with a history of chronic urticaria and 11 . 8 % of subjects with an history of NSAID - induced urticaria / angioedema or angioedema alone ( with or without chronic urticaria ) resulted to be intolerant to alternative drugs .
### Output Text:
Furthermore , 18 . 28 % of patients with a history of chronic urticaria and 11 . 8 % of subjects with an history of <span class="chemical">NSAID</span> - induced urticaria / angioedema or angioedema alone ( with or without chronic urticaria ) resulted to be intolerant to alternative drugs . 