Actually, I am quite advanced in reading, as well as in etiquette and civil, intelligent discussion. In fact, my reading comprehension skills tell me that "most" is a minor contributor to that statement, included only to cover the fact that few things in the world are 100%. Indeed, if the writer of the sentence did not believe that scarring was a result of SQ injection and not IM, I believe the sentence would not have been written in the first place.