Thank you very much.
Mr. Parkinson, a question was put to you earlier on whether there's been any data to show that once you enact this, it changes. I'm a physician, and I've read my share of medical research. If there's one thing I've noted, it's all the pitfalls of population-based research. I know just enough statistics to know that in research, you have to hire a statistician to make sense of numbers.
Would it be fair to say that if you tried to track this, there would be too many confounding variables to say that this made a difference once you did it? These are things like changing rates of drug use and other things that were independent of that. Would that not make trying to prove this after the fact—