First link of that footnote was just to describe the scale, via the Wikipedia article. Second link (on the word 'validated') was to this article: http://www.nc

First link of that footnote was just to describe the scale, via the Wikipedia article. Second link (on the word 'validated') was to this article: http://www.ncbi.nlm.nih.gov/pubmed/10497804 http://www.ncbi.nlm.nih.gov/pubmed/10497804