This study underwent rigorous ethical reviews. As you know, the women came from two provinces, Ontario and Quebec, and the investigators in these provinces came from Laval University in Quebec and from Cancer Care Ontario. Reviews were done by the University of Toronto ethics review as well as l'Hôpital du Saint-Sacrement ethical review process in those two provinces.
Other review processes were done during the time of the record linkage, which happened later, as I mentioned. That also required extensive ethical review processes.
So the answer to that is that this study met all the rigorous ethical reviews that are necessary.