The only thing I can say, again, is that virtually all studies are subject to regulatory scrutiny.
There's the editorial policy of a journal. You could submit a study to a journal and be refused publication. So I do not believe there is an intentional attempt not to disclose negative studies.
The other thing, too, is that the regulatory authorities do not discriminate in terms of saying, this study is positive, this study is negative. It's the bulk of the evidence, it's that risk-benefit balance that we look at. It doesn't necessarily come from one trial.