The most-cited rank order listing depends on Westlaw searches in the JLR database looking for citation abbreviations. I've just noticed an issue in Westlaw, which I expect not to be a serious problem, but is rather interesting. It relates to priority of connectors and set results when doing a search with a sequence of "+3" connectors (or higher).
It can be seen best with a simple JLR search like:
5 +1 J +3 L +3 MED = 3 articles one of which is a bad hit with "MED" before "L"
5 +1 (J +3 L) +3 MED = same result
5 +1 J +3 (L +3 MED) = 2 articles
Due to the processing of result sets from left to right "J +3 L" is processed before "MED" and then when "MED" is processed it can follow either "J" OR "L" within 3 words and can thus retrieve a document containing "J. of Med. & L" which is quite counter-intuitive, and not at all what's wanted in this particular search.
Looking at another search in Lexis (U.S. & Canadian Law Reviews), and in Westlaw(JLR):
LX: ONE +3 FIT +3 SIZE = 9
WL: ONE +3 FIT +3 SIZE = 2735
It can be seen that Lexis does a search where each word precedes the next, but Westlaw is returning results on "one size fits all" which to my way of thinking is incorrect.