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: Concomitantly , the diastolic diameter of the LV base and LV sphericity decreased ( i . e . , improved ) from 37 . 4 + / - 9 . 3 to 35 . 9 + / - 10 mm ( p = 0 . 063 ) , and from 67 . 9 + / - 18 . 6 % to 65 . 3 + / - 18 . 9 % ( p = 0 . 016 ) , respectively .
### Output Text:
Concomitantly , the diastolic diameter of the LV base and LV sphericity decreased ( i . e . , improved ) from 37 . 4 + / - 9 . 3 to 35 . 9 + / - 10 mm ( p = 0 . 063 ) , and from 67 . 9 + / - 18 . 6 % to 65 . 3 + / - 18 . 9 % ( p = 0 . 016 ) , respectively . 