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We don't compare one to the other, the only way that you can effectively do that is by having head-to-head comparisons in a clinical trial, which was not done. And so, as Andy said, and I'll reiterate, it's a question if you go in and the vaccine is available to you, I would take the first available vaccine because the most important thing to do is to get vaccinated and not to try and figure out if one may be or may not be better than the other.