The full report is published in the Lancet. Comment at <http://www.thelancet.com/journals/lancet/article/PIIS0140673606694920/fulltext>. Full article at <http://www.thelancet.com/journals/lancet/article/PIIS0140673606694919/fulltext>. (Free registration necessary) Paddy http://apling.freeservers.com