Δαφνη Ευτυχια Αρθουρος

I would hazard a guess that like much medical research, they worked with men only to reduce the number of variables, and figured someone could do followup research with women if they got significant results. Of course, this sort of thing is the reason that the media reported on heart disease for years as a male disease (stressed executives and that sort of thing) even though it wasn't. It's not that they're doing anything wrong per se on any individual study (you really are more likely to get a significant result with a certain group size if you eliminate gender as a confounding variable), but the fact that researchers got into the habit of nearly always choosing to research men only instead of women only is a sign of something wrong.