Question: Choice of returned units

Hello!

I use Maple to calculate a variety of physiology questions. But i keeps using the standardized SI unites and not the ones i plug in. Is there a way to get maple to behave differently? Ive added a screenshot of an example. It comes out in m3/s when i just want it in ml/min. 

GFR = (18.2*Unit(('mg')/('ml')))*1.5*Unit(('ml')/('min'))/(0.201*Unit(('mg')/('ml')));
 = 
                                            / 3\
                                            |m |
                GFR = 0.000002263681592 Unit|--|
                                            \s /

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