That medical science, like all sciences progress at such a rapid rate. It has recently been announced that Bonjela (a mouth ulcer treatment) could be harmful to under 16s but last month you would have given it without a second thought.
If I was to write an academic paper using sources only from, say, ten years ago it would be thrown out by my supervisor. Citing the most up-to-date research is crucial since things can move so fast. Unless there are points which have been raised in the past which have yet to be refuted, in which case it is fine to use.
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