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Glaxo didn't put these women in *more* danger than they already were, they just didn't put them in *less* danger. The women given the placebo were no worse off than they would have been had they not been involved with the drug trial at all. You have to have a control group for *any* experiment like this, right? If you know you're involved in a drug trial, you know you might be getting a placebo. That's just the way things are.