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It's worth noting that "Point C" is not 'worse' than point C', so long as you can apply mathematical corrections. If a doctor consistently characterizes 90% of cancers as infections, and 90% of infections as cancers, that doctor is useful to you - you just need to invert his responses, and all of a sudden you'll be getting solid results. --68.33.60.92 (talk) 18:11, 19 October 2008 (UTC)