There are several reasons for pursuing that investigation. One is the existing scientific literature. Science is not absolutely certain on all aspects of research, and there are some uncertainties.
I mentioned that there were some biological effects that require clarification. Many of the epidemiologic studies have been of moderate size. If there is a risk, it's probably very small. You'd need a large-scale study to clarify that, and that's what's being conducted.
We benefit either way from the results of this study. If in fact there is no risk, we'll have assurances of safety through the conduct of this very large study, and if in fact there is a small risk that has gone previously undetected in more limited studies, we have a chance to step in and intervene and address it as quickly as possible.