This will get you most of the way there. It processes all 27 pages, and creates a csv (well, actually tsv) with the first column being the named of the disease, the second column being the sub-type or see also entry, the third column is the URL, and the fourth is either level2 (sub disease) or level3 (see also). I have not processed the HTML for the Disease names, but that should be just a matter of a few search & replaces.
Diseases.kmmacros (11 KB)