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w/ = with

w/o = without

This comment is full of abbreviations (PD = Parkinson's Disease, AD = Alzheimer's Disease) that makes it a bit difficult to read (if you don't know / realize what those abbreviations stand for)

Mice are a good animal model for a lot of the human physiology.

"w/" is an abbreviation for "with". "w/ mice" should be read as "with mice".

The savings of just two characters does not worth the effort and mental pause to decode it

it's an exceptionally common way of writing with and without. similar to "etc." standing for "et cetera." at some point you don't "decode" it, thats just what it means.

It's a great abbreviation for handwriting, though. It also meshes really well with w/o.

not to horrify you but https://gomerblog.com/2014/12/soap-note/

the expensive kind...