I think, looking back in terms of the work I've been involved with in public health and thinking of the success of some of the other initiatives that have tried to grapple with complex issues—things like sudden unexpected infant death syndrome and a large number of preventable deaths from road traffic accidents—and thinking about what some of those key elements were that led to their success, a lot of the issues are still with us, but what we've seen is reductions over many years. I think one of the key elements is leadership, making sure that we've got that leadership at the top—and that's not only at the political level.