That is a really interesting article and research finding...
I guess its common sense that we should be presentable at work no matter what setting we are in. As we are catering to the basic human instincts.
If you think of it, the same applies the other way around if we could choose the sort of patients we would rather treat.... We look forward to the treatment sessions of a well dressed gentle man/lady who is clean and tidy, rather than the one with heavy body odour/smelly feet... (Not meaning to sound discriminative in anyway... But just wanting to make a point)