Not strictly an aviation matter, but one that the AAC will be interested in :
<a href="http://news.bbc.co.uk/hi/english/health/newsid_1738000/1738487.stm" target="_blank">http://news.bbc.co.uk/hi/english/health/newsid_1738000/1738487.stm</a>
It's a subject that's been covered here in the past....but I'm sure this has further to run in light of these latest findings.