In reply to Dave the Rave:
This is a specifically academic question though, it has an answer according to the best evidence.
Anyone who trusts UKC more than a published review of the literature is not getting good information! Yes, getting the answer off the internet takes a bit of skill, but unless someone provides a link to something decent and the OP ignores everything else, asking UKC just muddies the water.
UKC is brilliant for some things, e.g. finding a plumber in Sheffield, or getting opinions about a car. For medical advice, it is wholly inappropriate!