So, you've read the references at the bottom of the page

Have I? - where did I say that?

or did you just skip over the first hundred words and dismiss it all as "fairly useless"?

Do you  mean 'skip,' or do you actually mean 'skim' ?

No, mainly it referred to your post actually.

Why do you appear to assume others haven't seen your google link before?

And what relevance does it have? Its largely discussed in a clinical context, and one not universally used or accepted.Are we talking in the same context? - I think not.